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1,330 results on '"Bouchoule, A."'

155. Study of initial dust formation in an Ar-SiH4 discharge by laser induced particle explosive evaporation

Author

Boufendi, L., Hermann, J., Bouchoule, A., Dubreuil, B., Stoffels, E., Stoffels, W.W., and Giorgi, M.L. de

Subjects
Bulk solids -- Growth, Evaporation -- Analysis, Lasers -- Usage, Physics
Abstract

The initial clustering process was crucial for nanometer scale crystallite formation during particulate growth in a low pressure radio-frequency discharge. Laser induced particle explosive evaporation (LIPEE) was used to study in situ the early phases of particulate growth. Large scale particles were formed during the coalescence process.

Published
1994

156. Highly attenuating external cavity for picosecond-tunable pulse generation from gain/Q-switched laser diodes

Author

Bouchoule, Sophie, Stelmakh, Nikolai, Cavelier, Marc, and Lourtioz, Jean-Michel

Subjects
Diodes, Laser -- Research, Pulse generators -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

An in depth analysis of gain/Q-switched laser diodes combined with a decreasing and selective external cavity was conducted. The employment of the highly attenuating cavity was revealed to be a simple way to induce picosecond single-mode pulses with high tunability. The new scheme dispenses with AR coating on the internal diode facet and external cavity tuning. The experimental data has been successfully analyzed by employing the small-signal technique during the course of pulse build-up.

Published
1993

157. Cross-Polarized Dual-Frequency VECSEL at 1.5 μm for Fiber-Based Sensing Applications

Author

Patrice Chatellier, Jean-Louis Oudar, Aghiad Khadour, Lea Chaccour, Sophie Bouchoule, Kamel Merghem, and Guy Aubin

Subjects
Optical amplifier, Materials science, Optical fiber, business.industry, Physics::Optics, 02 engineering and technology, Laser, Optical microcavity, Vertical-external-cavity surface-emitting-laser, Atomic and Molecular Physics, and Optics, law.invention, Cavity ring-down spectroscopy, Optical pumping, 020210 optoelectronics & photonics, Optics, law, Optical cavity, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Electrical and Electronic Engineering, business
Abstract

We have realized a dual-frequency vertical external cavity surface emitting laser (VECSEL) at 1.5 μm. Laser emission of two orthogonally polarized cavity modes is obtained by inserting a birefringent crystal into the VECSEL cavity. We have examined the influence of the different intracavity elements on the laser emission. It is shown that optimizing the free spectral range and the bandwidth of the intracavity Fabry–Perot etalon is of practical importance to achieve a stable single longitudinal laser emission for each of the two orthogonal polarizations. The optimization of the output power has also been investigated, and it is concluded that up to 50 mW output power can be expected in dual-frequency operation by adjusting the reflectivity of the output coupling mirror of the VECSEL cavity. The influence of different parameters on the stability of the dual-frequency emission has been studied. It is concluded that mechanical vibrations are the main cause of radio-frequency (RF) signal instability in our free-running VECSEL cavity. The design of a compact or mono-block cavity may allow meeting the stability requirements for optical fiber sensors based on Brillouin scattering.

Published
2016
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159. Propagation of polaritons in GaN waveguides up to 300K

Author

BRIMONT, Christelle, GUILLET, Thierry, DOYENNETTE, Laetitia, Réveret, François, Disseix, Pierre, Médard, François, Leymarie, Joël, Gromovyi, M., Alloing, B, RENNESSON, S., Semond, F., Zúñiga-Pérez, Jesús, Cambril, Edmond, Bouchoule, Sophie, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Pascal (IP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Centre National de la Recherche Scientifique (CNRS), SIGMA Clermont (SIGMA Clermont)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Centre de Nanosciences et de Nanotechnologies [Orsay] (C2N), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), ANR-16-CE24-0021,Plug-and-Bose,Laser à polaritons injecté electriquement à ultra-faible seuil(2016), and Université Nice Sophia Antipolis (... - 2019) (UNS)

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Materials Science, Condensed Matter::Other, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Physics::Optics
Abstract

International audience; Exciton-photon coupling in a waveguide geometry is attracting more and more interest in the field of polaritonics. Waveguide polaritons are obtained when the exciton and the guided mode of a photonic waveguide are brought in the strong coupling regime, in strong analogy with cavity polaritons in Fabry-Perot resonators. One of the first demonstrations of waveguide polaritons was reported in a waveguide embedding InGaAs/GaAs quantum wells, with a Rabi splitting of 6 meV [Walker et al., APL 102, 012109 (2013) and Nat. Comm. 6, 8317 (2015)], leading to the observation of ultra-low power temporal solitons at T=10K. Nitride materials offer the possibility to investigate polariton physics up to room temperature thanks to the large binding energy and large oscillator strength of the excitons in GaN. The first demonstration of strong coupling in nitrides waveguides was based on InGaN multiple quantum wells, with a Rabi splitting of 63 meV at 4K, and a strong coupling observed up to T=100K [Ciers et al., Phys. Rev. Applied 7, 034019 (2015)]. In the meantime, we have achieved polariton lasing in a waveguide geometry for the first time in another wide bandgap material, ZnO [Jamadi et al., Arxiv:1708.00501], up to room-temperature.Here we report the enhancement of the Rabi splitting in a bulk GaN slab waveguide, compared to the case of multiple quantum wells. The Rabi splitting in a monomode GaN waveguide reaches 140meV, and slightly decreases to 100 meV at T=300K. To measure it, we have fabricated diffraction gratings on the waveguides and performed polarization-resolved Fourier-space imaging of the TE and TM modes dispersion. Besides, through Fourier-space imaging and spectral filtering of the photoluminescence image we have measured the polaritons propagation length as a function of the detuning: at T=10K it amounts to 10µm at zero detuning and 30µm at more negative detuning (= -Rabi); most importantly, similar propagation lengths are observed up to room temperature.The increased Rabi splitting and large propagation lengths pave the way for the demonstration of polariton lasers at room temperature in a GaN waveguide, and for a control of the nonlinear processes in polariton fluids of light.

Published
2018

160. Cooling a Bose Gas by Three-Body Losses

Author

Isabelle Bouchoule, Max Schemmer, Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
Condensed Matter::Quantum Gases, Physics, Bose gas, [PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], Center (category theory), FOS: Physical sciences, General Physics and Astronomy, Flory–Huggins solution theory, 01 natural sciences, Atomic mass, 010305 fluids & plasmas, Transverse plane, Quantum Gases (cond-mat.quant-gas), Speed of sound, 0103 physical sciences, Harmonic, Atomic physics, Condensed Matter - Quantum Gases, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Dimensionless quantity
Abstract

We report the demonstration of cooling by three-body losses in a Bose gas. We use a harmonically confined one-dimensional (1D) Bose gas in the quasicondensate regime and, as the atom number decreases under the effect of three-body losses, the temperature $T$ drops up to a factor of 4. The ratio ${k}_{B}T/(m{c}^{2})$ stays close to 0.64, where $m$ is the atomic mass and $c$ the speed of sound in the trap center. The dimensionless 1D interaction parameter $\ensuremath{\gamma}$, evaluated at the trap center, spans more than 2 orders of magnitudes over the different sets of data. We present a theoretical analysis for a homogeneous 1D gas in the quasicondensate regime, which predicts that the ratio ${k}_{B}T/(m{c}^{2})$ converges towards 0.6 under the effect of three-body losses. More sophisticated theoretical predictions that take into account the longitudinal harmonic confinement and transverse effects are in agreement within 30% with experimental data.

Published
2018
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161. Noise reduction in a dual-frequency VECSEL at telecom wavelength using fully correlated pumping

Author

Ihsan Fsaifes, Ghaya Baili, Gregory Gredat, Sophie Bouchoule, Syamsundar De, Aliou Ly, Hui Liu, Fabienne Goldfarb, Remy Vatre, and Fabien Bretenaker

Subjects
Physics, Relative intensity noise, business.industry, Noise reduction, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Wavelength, Amplitude, law, 0103 physical sciences, Phase noise, Spontaneous emission, 0210 nano-technology, Telecommunications, business, Diode
Abstract

We demonstrate the noise reduction in a dual-frequency vertical-external-cavity surface-emitting laser at telecom wavelength using fully correlated pumping. A fully in-phase correlated pumping is obtained by polarization combining two single-mode fibered laser diodes in a single-mode fiber. With this pumping, ultra-low noises are observed, i. e. relative intensity noise lower than -140 dB/Hz, and beatnote phase noise suppression by 30 dB, getting close to the spontaneous emission limit. The generalized noise reduction is shown by modeling the beatnote phase noise spectra and relative intensity noise transfer gain depending on the in-phase correlation amplitude.

Published
2018
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162. Liquid crystal-based tunable photodetector operating in the telecom C-band

Author

Mehdi Alouini, Benjamin Boisnard, Christophe Levallois, Laurent Dupont, Sophie Bouchoule, Benattou Sadani, Véronique Bardinal, Salvatore Pes, Cyril Paranthoen, Thierry Camps, Jean-Baptiste Doucet, Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT), Département Optique (IMT Atlantique - OPT), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), ANR-14-ASTR-0007-01, Agence Nationale de la Recherche, ARED-VELOCE 8917, Conseil Régional de Bretagne, Direction Générale de l’Armement, ANR-14-ASTR-0007,HYPOCAMP,Lasers à cavités verticales accordables hybrides , contrôlées en polarisation et entièrement monolithiques pour la conception systèmes optiques et micro-ondes embarqués et compacts.(2014), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)

Subjects
Photocurrent, Amplified spontaneous emission, Materials science, business.industry, Photodetector, 02 engineering and technology, LC circuit, 01 natural sciences, Atomic and Molecular Physics, and Optics, Photodiode, law.invention, 010309 optics, Laser linewidth, 020210 optoelectronics & photonics, Optics, Liquid crystal, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, business, Tunable laser
Abstract

International audience; Liquid crystal (LC) microcells monolithically integrated on the surface of InGaAs based photodiodes (PDs) are demonstrated. These LC microcells acting as tunable Fabry-Perot filters exhibit a wavelength tunability of more than 100 nm around 1550 nm with less than 10V applied voltage. Using a tunable laser operating in the S and C bands, photocurrent measurements are performed. On a 70 nm tuning range covered with a driving voltage lower than 7V, the average sensitivity for the PD is 0.4 A/W and the spectral linewidth of the LC filter remains constant, showing a FWHM of 1.5 nm. Finally, the emission spectrum from an Er-doped fiber is acquired by using this tunable PD as a micro-spectrometer.

Published
2018
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163. TECHNOLOGIES POUR SOURCES LASER A SEMICONDUCTEURS III-V

Author

Bouchoule, Sophie, Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université ParisSud XI, and Prof. Abdallah Ougazzaden

Subjects
lasers et micro-émetteurs à semiconducteurs III-V, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, III-V semiconductors lasers and micro-emitters, composants photoniques, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], micro-nanotechnologies, plasma etching of III-V materials, photonic devices, physico-chimie de la gravure par plasma des matériaux III-V
Published
2018

164. Liquid crystal based tunable PIN-photodiodes for detection around 1.55-µm

Author

Laurent Dupont, Véronique Bardinal, Benattou Sadani, Benjamin Boisnard, Christophe Levallois, Jean-Baptiste Doucet, Mehdi Alouini, Thierry Camps, Sophie Bouchoule, Cyril Paranthoen, Salvatore Pes, Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT), Département Optique (IMT Atlantique - OPT), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), DGA-MRIS and Région Bretagne (grant ARED-VELOCE 8917), ANR-14-ASTR-0007,HYPOCAMP,Lasers à cavités verticales accordables hybrides , contrôlées en polarisation et entièrement monolithiques pour la conception systèmes optiques et micro-ondes embarqués et compacts.(2014), ANR-15-CE19-0012,DOCT-VCSEL,Tomographie par Cohérence Optique portable à source accordable MEMS-VCSEL pour l'analyse de la peau(2015), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)

Subjects
Materials science, Photodetector, 02 engineering and technology, Photodetection, 01 natural sciences, law.invention, 010309 optics, 020210 optoelectronics & photonics, WDM, law, Liquid crystal, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Photodiodes, business.industry, Optical communications, Photodetectors, Integrated optics, Laser, Photodiode, Full width at half maximum, Wavelength, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, Liquid-crystal, business, Tunable laser
Abstract

International audience; In this work, we report InGaAs based photodiodes integrating liquid crystal (LC) microcells resonant microcavity on their surface. The LC microcavities monolithically integrated on the photodiodes act as a wavelength selective filter for the device. Photodetection measurements performed with a tunable laser operating in the telecom S and C bands demonstrated a wavelength sweep for the photodiode from 1480 nm to 1560 nm limited by the tuning range of the laser. This spectral window is covered with a LC driving voltage of 7V only, corresponding to extremely low power consumption. The average sensitivity over the whole spectral range is 0.4 A/W, slightly lower than 0.6 A/W for similar photodiodes that do not integrate such a LC tunable filter. The quality of the filter integrated onto the surfaces of the photodiodes is constant over a large tuning range (70 nm), showing a FWHM of 1.5 nm.

Published
2018
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165. Liquid-Crystal alignment by a nanoimprinted grating for wafer-scale fabrication of tunable devices

Author

Jean-Baptiste Doucet, Laurent Dupont, Christophe Levallois, B. Sadani, Emmanuelle Daran, Véronique Bardinal, Cyril Paranthoen, Sophie Bouchoule, B. Boisnard, X. Lafosse, Thierry Camps, Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT), Département Optique (IMT Atlantique - OPT), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), ANR-15-CE19-0012 DOCT VCSEL, Agence Nationale de la Recherche, ANR-14-ASTR-0007,HYPOCAMP,Lasers à cavités verticales accordables hybrides , contrôlées en polarisation et entièrement monolithiques pour la conception systèmes optiques et micro-ondes embarqués et compacts.(2014), ANR-15-CE19-0012,DOCT-VCSEL,Tomographie par Cohérence Optique portable à source accordable MEMS-VCSEL pour l'analyse de la peau(2015), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)

Subjects
dry thick resist, Materials science, Fabrication, 02 engineering and technology, Grating, nanoimprint, film, 01 natural sciences, VCSEL, Vertical-cavity surface-emitting laser, law.invention, [SPI.MAT]Engineering Sciences [physics]/Materials, 010309 optics, 020210 optoelectronics & photonics, grating, law, 0103 physical sciences, soft transfer, 0202 electrical engineering, electronic engineering, information engineering, Wafer, liquid crystal devices, Electrical and Electronic Engineering, tunable optical filter, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, business.industry, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, SU-8, [SPI.TRON]Engineering Sciences [physics]/Electronics, Resist, Optical cavity, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, wafer-scale fabrication, Photonics, business
Abstract

A simple technology is demonstrated for the wafer-scale fabrication of liquid-crystal (LC) microcells that can be integrated in active optoelectronic devices. Fabrication of 1.55- $\mu \text{m}$ tunable Fabry–Perot optical micro-filter arrays is achieved owing to the insertion of a single nanoimprinted polymer grating dedicated to LC alignment and to the soft thermal transfer of a dry thick resist film between two highly reflective mirrors. The filter exhibits a spectral tuning range of 102 nm with only 18 V applied, as well as negligible internal loss, which makes it suitable for being inserted in a laser cavity. This constitutes a key step toward the large-scale integration of widely tunable photonic devices such as vertical-cavity surface-emitting lasers using LC technology.

Published
2018
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166. Guided polaritons in a GaN planar waveguide

Author

GUILLET, Thierry, BRIMONT, Christelle, DOYENNETTE, Laetitia, Réveret, François, Disseix, Pierre, Médard, François, Leymarie, Joël, Deparis, Christiane, Rennesson, Stephanie, Semond, Fabrice, Zúñiga-Pérez, Jesús, Cambril, Edmond, Bouchoule, Sophie, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Pascal (IP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Centre National de la Recherche Scientifique (CNRS), SIGMA Clermont (SIGMA Clermont)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Centre de Nanosciences et de Nanotechnologies [Orsay] (C2N), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), ANR-16-CE24-0021,Plug-and-Bose,Laser à polaritons injecté electriquement à ultra-faible seuil(2016), ANR-11-LABX-0014,GANEX,Réseau national sur GaN(2011), and Université Nice Sophia Antipolis (1965 - 2019) (UNS)

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Other, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Physics::Optics
Abstract

International audience; The slab waveguide geometry is attracting more and more interest in the field of polaritonics. Waveguide polaritons are obtained when an excitonic transition and a slab guided mode are brought in the strong coupling regime, in strong analogy with cavity polaritons in Fabry-Perot resonators. Waveguide polaritons have been first demonstrated in GaAs waveguide embedding InGaAs quantum wells, with a Rabi splitting of 6 meV [Walker et al., Nat. Comm. 6, 8317 (2015)]. There, at 10K, the polariton fluid of light presents strong optical nonlinearities, solitons are generated at very low power densities. Wide bandgap materials offer the possibility to combine stronc coupling, non-linearities and polariton lasing at 300K, as recently demonstrated for the first time in a ZnO slab waveguide [Jamadi et al., Arxiv:1708.00501]. In nitride materials, a first demonstration of strong coupling was reached in the waveguide geometry with InGaN multiple quantum wells, with a Rabi splitting of 63 meV [Ciers et al., Phys. Rev. Applied 7, 034019 (2015)].In this work we demonstrate the strong coupling in a bulk GaN waveguide grown on Silicon. The epitaxy of thick (500 nm) AlN buffer at high temperature (1000°C) followed by an AlGaN optical cladding layer allows for a good GaN quality. A thin SiO2 top layer is processed into gratings for the extraction of the guided polaritons. The dispersions of the polariton eigenmodes are measured through the diffraction at the gratings and exhibit a characteristic anti-crossing between the guided photons and the excitonic transition. A Rabi splitting Ω=150 ±30 meV for the TE0 polariton mode is deduced from the modeling of the dispersions.Further, the propagation of the guided polaritons is probed at T=10K under non-resonant excitation: the polaritons are generated at a focused excitation spot, and the attenuation of each polariton branch is measured through spatial filtering combined to far-field imaging. At negative detuning (-1.5Rabi) in the photonic regime, the propagation length is of the order of 200±80 µm (i.e. a attenuation of 50 cm-1). It decreases to 12±1µm (i.e. 840 cm-1) at zero detuning. Such waveguide polaritons have the potentiality for introducing non-linear polariton fluids into the realm of integrated photonics operating at room temperature.

Published
2018

167. Wafer-scale fabrication of Liquid-Crystal micro-cells for integration in 1.55 µm tunable photonic devices

Author

Boisnard, Benjamin, Sadani, Benattou, Levallois, Christophe, Camps, Thierry, Paranthoen, Cyril, Bouchoule, Sophie, DUPONT, Laurent, Doucet, Jean-Baptiste, Bardinal, Véronique, Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et Nanotechnologies (C2N (UMR_9001)), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Département Optique (IMT Atlantique - OPT), IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), ANR-14-ASTR-0007,HYPOCAMP,Lasers à cavités verticales accordables hybrides , contrôlées en polarisation et entièrement monolithiques pour la conception systèmes optiques et micro-ondes embarqués et compacts.(2014), ANR-15-CE19-0012,DOCT-VCSEL,Tomographie par Cohérence Optique portable à source accordable MEMS-VCSEL pour l'analyse de la peau(2015), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), and IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

168. Edge-emitting polariton laser and amplifier based on a ZnO waveguide

Author

O, Jamadi, F, Reveret, P, Disseix, F, Medard, J, Leymarie, A, Moreau, D, Solnyshkov, C, Deparis, M, Leroux, E, Cambril, S, Bouchoule, J, Zuniga-Perez, and G, Malpuech

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Other, Physics::Optics, Article
Abstract

We demonstrate edge-emitting exciton-polariton (polariton) laser operation from 5 to 300 K and polariton amplifiers based on polariton modes within ZnO waveguides. The guided mode dispersion below and above the lasing threshold is directly measured using gratings placed on top of the sample, fully demonstrating the polaritonic nature of the lasing modes. The threshold is found to be smaller than that expected for radiative polaritons in planar ZnO microcavities below 150 K and comparable above. These results open up broad perspectives for guided polaritonics by enabling easier and more straightforward implementation of polariton integrated circuits that exploit fast propagating polaritons, and, possibly, topological protection., Edge-Emitting Polariton lasers: A step closer to two-dimensional all-optical devices A type of laser that can propagate along tiny, two-dimensional horizontal cavities in semiconductor materials at room temperature could be used in novel all-optical devices. Polaritons are quasi-particles created from the resonant coupling of light (photons) and matter (electron-hole pairs, or ‘excitons’) in tiny enclosed spaces, such as the microcavities fabricated from semiconductor materials. Polariton lasers could enable researchers to build energy-efficient, compact all-optical devices. Guillaume Malpuech at the Institut Pascal in Clermont-Ferrand, France, and co-workers have designed a new type of polariton laser and amplifier operating at room temperature. Their design does not require the use of a microcavity but is based on the use of the polariton guided modes of a ZnO layer. This horizontal, guided geometry is appealing because it is easy to fabricate and to integrate in two-dimensional optical circuits.

Published
2018

169. Guided polaritons in a ZnO vertical microcavity

Author

Guillet, Thierry, Mallet-Dida, Léo, Brimont, Christelle, Doyennette, Laetitia, Jamadi, O., Réveret, François, Disseix, Pierre, Médard, François, Leymarie, Joël, Lafosse, Xavier, Bouchoule, Sophie, Deparis, Christiane, Rennesson, Stephanie, Semond, Fabrice, Zúñiga-Pérez, Jesús, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Pascal (IP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Centre National de la Recherche Scientifique (CNRS), SIGMA Clermont (SIGMA Clermont)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Orsay] (C2N), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), ANR-16-CE24-0021,Plug-and-Bose,Laser à polaritons injecté electriquement à ultra-faible seuil(2016), ANR-11-LABX-0014,GANEX,Réseau national sur GaN(2011), and Université Nice Sophia Antipolis (1965 - 2019) (UNS)

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Other, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Physics::Optics
Abstract

International audience; The polariton emission in a microcavity is usually measured from the surface, and little is known about the actual role of guided modes below the light cone in air; these can couple to the exciton transition and give rise to additional polaritons branches, creating thereby a polaritons leak channel, and can further collect part of the “vertical” polaritons emission. Overall, for a vertical microcavity they can be considered as a source of polariton losses. On the other hand, the physics of guided polaritons in waveguides has recently attracted some interest as a new class of fluids of light supporting bright temporal solitons, as well as a new type of polariton lasers [1-3].In this work we investigate the propagation and relaxation properties of guided polaritons in vertical microcavities based on ZnO active layers and we evidence their role in the dynamics of the polariton laser.Figure 1 illustrates the scheme of the study of the guided modes in a ZnO vertical microcavity with mesas, in the strong coupling regime. The excitonic reservoir is pumped non-resonantly under a focused spot, and feeds both the polaritons near k=0 and the guided polaritonic modes. The emission of the guided modes is observed at the mesa’s edge, together with the vertical emission. The microcavity operates as a polariton laser under pulsed optical pumping [4]. The guided modes are observed at energies below the minimum of the lower polariton branch. Interestingly, their spectrum presents fringes that are the signature of beatings between multiple guided modes, which are coherently pumped under the excitation spot. This observation, for distances up to 65µm, demonstrate the long ballistic propagation of the guided polaritons, and their efficient feeding by the excitonic reservoir. This last process competes with the relaxation towards the LPB.Under strong pulse excitation, the guided polaritonic modes influence the operation of the polariton laser. In the absence of cracks in the mesas, the polariton laser operates near k=0 and the corresponding peaks appear in the spectrum of the guided modes, indicating an efficient feeding of those modes beyond threshold. If cracks are present in the mesa, then an intricate dynamics can be observed, resulting from a competition between vertical (out-of-plane) and horizontal (in-plane) polariton lasing.

Published
2018

170. Some experimental results on out-of-equilibrium physics in a 1D Bose gas (Orale)

Author

Bouchoule, Isabelle, Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
[PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

171. Monolithic ZnO optical microcavities : from materials science to room-temperature polariton laser

Author

Jamadi, Omar, Deparis, C., Reveret, François, Bouchoule, S., Disseix, Pierre, Médard, François, Mihailovic, Martine, Solnyshkov, Dmitry, Malpuech, Guillaume, Leymarie, Joël, Leroux, M., Zúñiga-Pérez, Jesús, Institut Pascal (IP), SIGMA Clermont (SIGMA Clermont)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), and Université Nice Sophia Antipolis (1965 - 2019) (UNS)

Subjects
ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2018

175. Competition between horizontal and vertical polariton lasing in planar microcavities

Author

Jamadi, O., primary, Réveret, F., additional, Solnyshkov, D., additional, Disseix, P., additional, Leymarie, J., additional, Mallet-Dida, L., additional, Brimont, C., additional, Guillet, T., additional, Lafosse, X., additional, Bouchoule, S., additional, Semond, F., additional, Leroux, M., additional, Zuniga-Perez, J., additional, and Malpuech, G., additional

Published
2019
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178. Doubly-Charged Xe Ions Evidenced by Time Resolved RPA Measurement in the Far Field Plume of a Low-Power HET

Author

F. Diop, T. Gibert, A. Bouchoule, and L. Balika

Subjects
Physics, chemistry.chemical_element, Ion current, Condensed Matter Physics, 7. Clean energy, Plume, Ion, Anode, Time of flight, Xenon, chemistry, 13. Climate action, Plasma diagnostics, Atomic physics, Current (fluid)
Abstract

A low power Hall Effect Thruster (HET), based on a permanent magnet circuit, was investigated in the GREMI laboratory facility. The thruster operated in the working range between 50 and 300 W and the previously measured thrust is between 4 and 16 mN for an anodic efficiency respectively between 15% and 27%. The pulsed character of the thruster current is an important feature of this HET. The ion current's bursts are recorded at 30 and 70 cm from the exit plane in the thruster plume and are time-resolved, which lead to a preliminary analysis of the time of flight (TOF) phenomena. This paper presents a detailed study of these bursts of ion current in the plume. The total ion current is shown to be a superposition of 2 distinct contributions of charged species. In complement, a controlled single current interruption in stable anodic current condition leads to exactly the same features than in oscillating mode. This crucial verification garantees the validity of the time of flight origine of the two distinct contributions. Then, the slower one is the more intense and is proportional to the ion Xe+ current whereas the faster one could be attributed either to doubly-charged Xe++ or to superfast Xe+. The work presents a way to determine unambiguously the nature of the fast contribution by recording the Retardated Potential Analyser (RPA) signals at various repelling grid potentials with respect to time. The energy distribution of the 2 wellseparated contributions are reconstructed and confirms the contribution of doubly-charged xenon ions (Xe++) in the plume. This way of RPA collecting data and interpretation presents the main advantage tobe an easy way for the identification of the nature of the charged species in the plume. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Published
2015
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179. BAlN thin layers for deep UV applications

Author

Tarik Moudakir, Suresh Sundaram, Xin Li, Youssef El Gmili, Russell D. Dupuis, Paul L. Voss, Gilles Patriarche, Frédéric Genty, Jean-Paul Salvestrini, Sophie Bouchoule, and Abdallah Ougazzaden

Subjects
010302 applied physics, Thin layers, Materials science, Scanning electron microscope, business.industry, Zone axis, 02 engineering and technology, Surfaces and Interfaces, Substrate (electronics), 021001 nanoscience & nanotechnology, Condensed Matter Physics, Epitaxy, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, 0103 physical sciences, Materials Chemistry, Optoelectronics, Metalorganic vapour phase epitaxy, Electrical and Electronic Engineering, 0210 nano-technology, business, Layer (electronics), Wurtzite crystal structure
Abstract

In this work, wurtzite BAlN layers with boron composition as high as 12% were successfully grown by MOVPE. The growth was performed at 650 °C and then annealed at 1020 °C. Low temperature growth was used in order to alleviate B-rich phase poisoning under high TEB/III ratio. The growth was performed by continuous epitaxy as well as by flow-modulate epitaxy. BAlN single layers with clearly defined X-ray diffraction peaks were achieved on AlN templates which are appropriate substrates for deep UV devices, as well as on GaN templates to facilitate distinguishing of the XRD peak of BAlN from the substrate peak. The layer demonstrated columnar crystalline features and inherited wurtzite structure from substrates. Cross-section STEM image (bright field) of 75 nm thick BAlN layers containing 12% boron taken along the [11−2 0] zone axis. Zone A is lattice-oriented along c-axis and zone B has columnar structure; (b) higher magnification image for the top part of the layer; (c) higher magnification image for the film/substrate interface.

Published
2015
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182. Monitoring squeezed collective modes of a one-dimensional Bose gas after an interaction quench using density ripples analysis

Author

Aisling Johnson, Isabelle Bouchoule, Max Schemmer, Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
Physics, Condensed Matter::Quantum Gases, Bose gas, [PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], Ripple, Mode (statistics), FOS: Physical sciences, Spectral density, 01 natural sciences, 010305 fluids & plasmas, Quadrature (mathematics), Time of flight, Quantum Gases (cond-mat.quant-gas), Phase space, Quantum electrodynamics, 0103 physical sciences, Harmonic, 010306 general physics, Condensed Matter - Quantum Gases
Abstract

International audience; We investigate the out-of-equilibrium dynamics following a sudden quench of the interaction strength, in a one-dimensional quasi-condensate trapped at the surface of an atom chip. Within a linearized approximation, the system is described by independent collective modes and the quench squeezes the phase space distribution of each mode, leading to a subsequent breathing of each quadrature. We show that the collective modes are resolved by the power spectrum of density ripples which appear after a short time of flight. This allows us to experimentally probe the expected breathing phenomenon. Our results are in good agreement with theoretical predictions which take the longitudinal harmonic confinement into account.

Published
2017
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184. Monitoring squeezed collective modes after an interaction quench (Orale)

Author

Bouchoule, Isabelle, Schemmer, Maximilian, Johnson, Aisling, Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
[PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

185. Collective many-body bounce in the breathing-mode oscillations of a Tonks-Girardeau gas

Author

Y. Y. Atas, Isabelle Bouchoule, Dimitri M. Gangardt, Karen Kheruntsyan, Australian Research Council [Canberra] (ARC), Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), University of Birmingham [Birmingham], Centre of excellence for quantum atom optics (ARC), and University of Queensland [Brisbane]

Subjects
Physics, Quantum Physics, Isentropic process, [PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], Mode (statistics), Non-equilibrium thermodynamics, FOS: Physical sciences, Mechanics, 01 natural sciences, 010305 fluids & plasmas, Momentum, Tonks–Girardeau gas, Classical mechanics, Quantum Gases (cond-mat.quant-gas), 0103 physical sciences, Rectangular potential barrier, 010306 general physics, Hydrodynamic theory, Condensed Matter - Quantum Gases, Quantum Physics (quant-ph), ComputingMilieux_MISCELLANEOUS, Phase diagram
Abstract

We analyse the breathing-mode oscillations of a harmonically quenched Tonks-Giradeau (TG) gas using an exact finite-temperature dynamical theory. We predict a striking collective manifestation of impenetrability---a collective many-body bounce effect. The effect, while being invisible in the evolution of the in-situ density profile of the gas, can be revealed through a nontrivial periodic narrowing of its momentum distribution, taking place at twice the rate of the fundamental breathing-mode frequency. We identify physical regimes for observing the many-body bounce and construct the respective nonequilibrium phase diagram as a function of the quench strength and the initial temperature of the gas. We also develop a finite-temperature hydrodynamic theory of the TG gas, wherein the many-body bounce is explained by an increased thermodynamic pressure of the gas during the isentropic compression, which acts as a potential barrier at the inner turning points of the breathing cycle., Comment: 5 pages, 4 figures, and Supplemental Material. arXiv admin note: substantial text overlap with arXiv:1608.08720

Published
2017
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186. Integration of tunable liquid crystal microcells on 1.55μm photodetector arrays using nanoimprint technology

Author

Sadani, Benattou, Camps, Thierry, Boisnard, Benjamin, Doucet, Jean-Baptiste, Bardinal, Véronique, Levallois, Christophe, Paranthoen, Cyril, Bouchoule, Sophie, DUPONT, Laurent, Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Équipe Micro-Nanofluidique pour les sciences de la vie et de l’environnement (LAAS-MILE), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Département Optique (IMT Atlantique - OPT), IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Équipe MICrosystèmes d'Analyse ( LAAS-MICA ), Laboratoire d'analyse et d'architecture des systèmes [Toulouse] ( LAAS ), Institut National Polytechnique [Toulouse] ( INP ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National Polytechnique [Toulouse] ( INP ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Équipe Micro-Nanofluidique pour les sciences de la vie et de l’environnement ( LAAS-MILE ), Service Techniques et Équipements Appliqués à la Microélectronique ( LAAS-TEAM ), Fonctions Optiques pour les Technologies de l'informatiON ( FOTON ), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Institut National des Sciences Appliquées - Rennes ( INSA Rennes ) -École Nationale Supérieure des Sciences Appliquées et de Technologie ( ENSSAT ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Bretagne Loire ( UBL ) -IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ), Centre de Nanosciences et de Nanotechnologies [Marcoussis] ( C2N ), Université Paris-Sud - Paris 11 ( UP11 ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Département Optique ( OPT ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)

Subjects
photonic, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Physics::Optics, [ SPI.OPTI ] Engineering Sciences [physics]/Optics / Photonic
Abstract

International audience; Compact wavelength-tunable photonic devices are key elements for the development of next-generation optical communication systems and miniaturized optical sensors.

Published
2017

187. On the Mechanism of In Nanoparticle Formation by Exposing ITO Thin Films to Hydrogen Plasmas

Author

Stéphane Guilet, Wanghua Chen, Xavier Lafosse, Pere Roca i Cabarrocas, Edmond Cambril, Kamel Merghem, Sophie Bouchoule, Laurent Couraud, Jean-Luc Maurice, Zheng Fan, Linwei Yu, Laboratoire de physique des interfaces et des couches minces [Palaiseau] (LPICM), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Microstructures et de Microélectronique (L2M), College of Information and Electrical Engineering [Beijing] (CIEE), and China Agricultural University (CAU)

Subjects
Materials science, Hydrogen, Evaporation, Nanoparticle, chemistry.chemical_element, Nanotechnology, 02 engineering and technology, 01 natural sciences, 0103 physical sciences, Electrochemistry, General Materials Science, Thin film, Spectroscopy, Deposition (law), ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Coalescence (physics), Surfaces and Interfaces, Plasma, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Chemical engineering, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Grain boundary, 0210 nano-technology
Abstract

We present our systematic work on in situ generation of In nanoparticles (NPs) from the reduction of ITO thin films by hydrogen (H2) plasma exposure. In contrast with NP deposition from vapor phase (i.e. evaporation), ITO surface can be considered as a solid reservoir of In atoms thanks to the H2 plasma reduction. On one hand, below the In melting temperature, solid In NPs formation is governed by island-growth mode, which is however a self-limiting process as H2 plasma/ITO interaction will be gradually eliminated by the growing In NPs that covers the ITO surface. On the other hand, we show that above the melting temperature, In droplets prefer to grow along the grain boundaries on ITO surface and a dramatic coalescence occurs when the growing NPs connect with each other. This growth-connection-coalescence behavior is even strengthened on In/ITO bilayers, where In particles larger than 10 μm can be formed, which are made of evaporated In atoms and in situ released ones. Thanks to this understanding, we ma...

Published
2017
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188. Long-lived non-thermal states realized by atom losses in one-dimensional quasi-condensates

Author

Aisling Johnson, Max Schemmer, Stuart S. Szigeti, Isabelle Bouchoule, Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), The University of Queensland, and University of Queensland [Brisbane]

Subjects
Physics, Condensed Matter::Quantum Gases, Bose gas, Field (physics), [PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], Quantum noise, FOS: Physical sciences, Harmonic potential, State (functional analysis), 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Nonlinear system, Character (mathematics), Quantum Gases (cond-mat.quant-gas), Quantum mechanics, 0103 physical sciences, Atom, 010306 general physics, Condensed Matter - Quantum Gases
Abstract

International audience; We investigate the cooling produced by a loss process non selective in energy on a one-dimensional (1D) Bose gas with repulsive contact interactions in the quasi-condensate regime. By performing nonlinear classical field calculations for a homogeneous system, we show that the gas reaches a non-thermal state where different modes have acquired different temperatures. After losses have been turned off, this state is robust with respect to the nonlinear dynamics, described by the Gross-Pitaevskii equation. We argue that the integrability of the Gross-Pitaevskii equation is linked to the existence of such long-lived non-thermal states, and illustrate this by showing that such states are not supported within a non-integrable model of two coupled 1D gases of different masses. We go beyond a classical field analysis, taking into account the quantum noise introduced by the discreteness of losses, and show that the non-thermal state is still produced and its non-thermal character is even enhanced. Finally, we extend the discussion to gases trapped in a harmonic potential and present experimental observations of a long-lived non-thermal state within a trapped 1D quasi-condensate following an atom loss process.

Published
2017

189. Interplay between vertical emission and guided emission in a ZnO microcavity polariton laser

Author

Mallet-dida, Léo, BRIMONT, Christelle, Lafosse, Xavier, Bouchoule, Sophie, Semond, Fabrice, Zúñiga-Pérez, Jesús, GUILLET, Thierry, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Orsay] (C2N), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay

Subjects
Condensed Matter::Quantum Gases, Condensed Matter::Other, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Physics::Optics
Abstract

International audience; The polariton emission in a microcavity is usually measured from the surface, and little is known about the actual role of guided modes below the light cone in air, that can couple to the exciton transition, collect part of the emission and contribute to polariton losses. In this work we investigate a ZnO planar microcavity with mesas. The emission of the guided modes is observed at the mesa’s edge, together with the vertical emission. The microcavity operates as a polariton laser under pulsed optical pumping [1].The spectra collected under the excitation spot and at the mesa’s edge are very different, as shown on figure 1a. The vertical emission is dominated by the lower polariton branch (LPB) associated to the cavity mode whereas the edge emission forms a broad peak modulated by fringes which spacing decreases as the spot moves away from the edge. While these fringes could indicate Fabry-Perot oscillations of polaritons propagating in-plane, in analogy with radiative polaritons in GaAs microcavity wires [2], a careful analysis shows that they are the signature of beatings between 5 to 10 guided modes, without being necessary to invoke multiple reflections. These modes have a large attenuation length of 27 µm, intermediate between the propagation length of LPB polaritons (a few µm in a ZnO microcavity [3]) and the one of waveguide polaritons (100µm in a GaN microcavity [4]).Under pulsed optical pumping, the guided modes are strongly excited. They form leaky modes for the excitonic reservoir, as well as for the LPB polaritons themselves. Most interestingly, when the vertical microcavity displays polariton lasing, the polariton laser emission feeds the guided modes, which then cascade in energy (Fig. 1b,c).This work evidences therefore that the threshold of the polariton laser in conventional vertical microcavities is increased due to the existence of usually hidden guided modes, that can deplete the exciton reservoir and collect resonantly scattered light from the lasing LPB mode.

Published
2017

190. Class-A operation of an optically-pumped 1.6 µm-emitting quantum dash-based vertical-external-cavity surface-emitting laser on InP

Author

Salvatore, Pes, Cyril, Paranthoën, Christophe, Levallois, Nicolas, Chevalier, Cyril, Hamel, Kevin, Audo, Goulc'hen, Loas, Steve, Bouhier, Carmen, Gomez, Jean-Christophe, Harmand, Sophie, Bouchoule, Hervé, Folliot, Mehdi, Alouini, Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), ANR, DGA, Région Bretagne, ANR-14-ASTR-0007,HYPOCAMP,Lasers à cavités verticales accordables hybrides , contrôlées en polarisation et entièrement monolithiques pour la conception systèmes optiques et micro-ondes embarqués et compacts.(2014), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quantum dash lasers, Semiconductor lasers, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Vertical External Cavity Surface-Emitting Lasers, Phase noise, Class-A, VECSEL, Single-frequency, Linewidth, [SPI.MAT]Engineering Sciences [physics]/Materials, RIN noise, Semiconductor disk laser, III V semiconductors, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract

International audience; A continuous-wave 1.6 µm-emitting InAs Quantum Dash-based Optically-Pumped Vertical-External-Cavity Surface-Emitting Laser on InP is demonstrated. The laser emits in the L-band with a stable linear polarization. Up to 163 mW output power has been obtained in multi-transverse mode regime. Single-frequency regime is achieved in the 1609-1622 nm range, with an estimated linewidth of 22 kHz in a 49 mm cavity, and a maximum emitted power of 7.9 mW at 1611 nm. In such conditions, the laser exhibits a Class-A behavior, with a cut-off frequency of 800 kHz and a shot-noise floor of −158 dB/Hz for 2 mA of detected photocurrent.

Published
2017
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191. Quantum Dash-based Vertical-External-Cavity Surface-Emitting Laser on InP

Author

Pes, Salvatore, Levallois, Christophe, Paranthoen, Cyril, Chevalier, Nicolas, Hamel, Cyril, Gomez, Carmen, Harmand, Jean-Christophe, Bouchoule, Sophie, Folliot, Hervé, Alouini, Mehdi, Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), ANR, DGA, Région Bretagne, ANR-14-ASTR-0007,HYPOCAMP,Lasers à cavités verticales accordables hybrides , contrôlées en polarisation et entièrement monolithiques pour la conception systèmes optiques et micro-ondes embarqués et compacts.(2014), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)

Subjects
Semiconductor disk laser, Laser linewidth, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Vertical External Cavity Surface-Emitting Lasers, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], VECSEL, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, InP based devices, Quantum dash laser, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; An Optically-Pumped InAs Quantum Dash-based Vertical-External-Cavity Surface-Emitting Laser (OP-QDH-VECSEL) on InP is demonstrated. In multi-mode operation, the device emits up to 163 mW at T=20°C (pump limited) in the 1615-1628 nm wavelength range. When forced to oscillate in the single-frequency regime, it shows a maximum output power of 7.9 mW at 1610 nm, for a T=19.5°C. The emitted light is linearly polarized along the QDH growth direction ([1-10] crystallographic axis). The single-frequency linewidth of the OP-QDH-VECSEL has been estimated to 22 kHz, for a cavity length of 49 mm.

Published
2017

192. Monte Carlo wave-function description of losses in a one-dimensional Bose gas and cooling to the ground state by quantum feedback

Author

Max Schemmer, R. Photopoulos, A. Johnson, and Isabelle Bouchoule

Subjects
Physics, Bose gas, Monte Carlo method, 01 natural sciences, 010305 fluids & plasmas, Position (vector), Phase space, Quantum electrodynamics, 0103 physical sciences, Coherent states, 010306 general physics, Ground state, Wave function, Quantum
Abstract

The effect of atom losses on a homogeneous one-dimensional Bose gas lying within the quasicondensate regime is investigated using a Monte Carlo wave-function approach. The evolution of the system is calculated, conditioned by the loss sequence, namely, the times of individual losses and the position of the removed atoms. We describe the gas within the linearized Bogoliubov approach. For each mode, we find that, for a given quantum trajectory, the state of the system converges towards a coherent state, i.e., the ground state, displaced in phase space. We show that, provided losses are recorded with a temporal and spatially resolved detector, quantum feedback can be implemented and cooling to the ground state of one or several modes can be realized.

Published
2017
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193. Exact nonequilibrium dynamics of finite-temperature Tonks-Girardeau gases

Author

Karen Kheruntsyan, Isabelle Bouchoule, Dimitri M. Gangardt, Y. Y. Atas, University of Queensland, School of Mathematics and Physics, Brisbane, Queensland 4072, Australia, University of Queensland [Brisbane], School of Physics and Astronomy [Birmingham], University of Birmingham [Birmingham], Laboratoire Charles Fabry / Optique atomique, Laboratoire Charles Fabry (LCF), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
Physics, Condensed Matter::Quantum Gases, Quantum Physics, Basis (linear algebra), [PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas], Non-equilibrium thermodynamics, Fredholm determinant, FOS: Physical sciences, Harmonic (mathematics), 01 natural sciences, 010305 fluids & plasmas, Classical mechanics, Exact solutions in general relativity, Quantum Gases (cond-mat.quant-gas), 0103 physical sciences, Condensed Matter - Quantum Gases, 010306 general physics, Wave function, Quantum Physics (quant-ph), Quantum, Boson
Abstract

Describing finite-temperature nonequilibrium dynamics of interacting many-particle systems is a notoriously challenging problem in quantum many-body physics. Here we provide an exact solution to this problem for a system of strongly interacting bosons in one dimension in the Tonks-Girardeau regime of infinitely strong repulsive interactions. Using the Fredholm determinant approach and the Bose-Fermi mapping we show how the problem can be reduced to a single-particle basis, wherein the finite-temperature effects enter the solution via an effective "dressing" of the single-particle wavefunctions by the Fermi-Dirac occupation factors. We demonstrate the utility of our approach and its computational efficiency in two nontrivial out-of-equilibrium scenarios: collective breathing mode oscillations in a harmonic trap and collisional dynamics in the Newton's cradle setting involving real-time evolution in a periodic Bragg potential., Comment: Final published version in PRA style; moved Supplemental Material into main text; 6 pages, 3 figures

Published
2017

194. Hybrid III-V on SOI nanolaser diodes

Author

Fabrice Raineri, Sophie Bouchoule, Isabelle Sagnes, Guillaume Crosnier, Rama Raj, and Dorian Sanchez

Subjects
Materials science, business.industry, Nanolaser, Physics::Optics, Silicon on insulator, Power efficient, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Semiconductor laser theory, Condensed Matter::Materials Science, Computer Science::Emerging Technologies, Optoelectronics, Photonics, business, Electron-beam lithography, Photonic crystal, Diode
Abstract

We demonstrate a novel class of compact and power efficient optoelectronic devices integrated on SOI photonic circuit based on InP photonic crystals nanocavities. In particular, results on electrically injected hybrid nanolasers will be shown.

Published
2017
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195. SiNx/organic photonic crystal microcavity optimization for the fabrication of thin-film micro-laser

Author

Sophie Bouchoule, François Gourdon, N. Fabre, Alejandro M. Yacomotti, Grégory Barbillon, and Edmond Cambril

Subjects
Fabrication, Materials science, business.industry, Doping, Laser, Optical microcavity, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, Optics, law, Optoelectronics, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Thin film, business, Layer (electronics), Lasing threshold, Photonic crystal
Abstract

We report on the optimization of 2D planar photonic crystal (PhC) SiN x microcavities for the fabrication of surface-emitting thin-film organic micro-lasers with a low lasing threshold (~10 μJ/cm 2 ). Modified H2 and L3 PhC-microcavity geometries are designed in order to achieve quality factors Q in the range of 1000–2000 with a good matching of the cavity mode spectral position with the emission range of the organic layer. 3D-Finite Difference Time Domain (3D-FDTD) simulations show that the etch depth in the SiO 2 buffer layer has to be optimized in order to maintain the Q > 1000 , depending on the thickness of the organic layer to be evaporated onto the SiN x /SiO 2 PhC pattern. 3D-FDTD simulations also show that the optical microcavity properties are robust against typical variations of the dimensions occurring in the technological process. The PhC microcavities are designed and fabricated to be used with tris(8-hydroxyquinolinato)aluminum ( Alq3 ) doped with 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran ( DCJTB ) as the gain material.

Published
2014
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196. Recent advances in development of vertical-cavity based short pulse source at 1.55 μm

Author

Jean-Christophe Harmand, Gilles Patriarche, Guy Aubin, Jean-Louis Oudar, Zhuang Zhao, and Sophie Bouchoule

Subjects
Materials science, business.industry, External cavity, Laser, Electronic, Optical and Magnetic Materials, law.invention, Pulse (physics), chemistry.chemical_compound, Wavelength, Optics, chemistry, Mode-locking, law, Picosecond, Indium phosphide, Optoelectronics, Electrical and Electronic Engineering, business, Pulse-width modulation
Abstract

This paper reviews and discusses recent developments in passively mode-locked vertical external cavity surface emitting lasers (ML-VECSELs) for short pulse generation at 1.55 μm. After comparing ML-VECSELs to other options for short pulse generation, we reviewed the results of ML-VECSELs operating at telecommunication wavelength and point out the challenges in achieving sub-picosecond operation from a ML-VECSEL at 1.55 μm. We described our recent work in the VECSELs and semiconductor saturable absorber mirrors (SESAMs), their structure design, optimization and characterization, with the goal of moving the pulse width from picosecond to sub-picosecond.

Published
2014
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197. Argon ionization improvement in a plasma thruster induced by few percent of xenon

Author

André Bouchoule, Fatou Diop, and Titaina Gibert

Subjects
Propellant, Physics, Argon, Ion beam, Spacecraft propulsion, chemistry.chemical_element, Plasma, Condensed Matter Physics, 01 natural sciences, Ion source, 010305 fluids & plasmas, Computational physics, Xenon, chemistry, Physics::Plasma Physics, Ionization, Physics::Space Physics, 0103 physical sciences, 010306 general physics
Abstract

In spite of its high cost, xenon gas is known as both the most efficient and commonly used propellant for plasma thrusters in space technologies. Argon, a gas by far less costly, is widely used in other technologies, but a much lower efficiency of ionization, as obtained for example in closed electron drift thrusters, prevents its use in R&D programs and development of space thrusters. This paper shows that a drastic increase in argon ionization can be obtained in a low power thruster when only a few percent of xenon are added in the argon flow. Besides the increase in the ion beam current in the plume generated by the thruster, a net increase in the ion kinetic energy is observed. These two features are of interest in terms of thrust efficiency. These results, obtained for a small size closed electron drift thruster, could be even more spectacular for higher power devices, suggesting further investigations for space propulsion and/or ion source applications.In spite of its high cost, xenon gas is known as both the most efficient and commonly used propellant for plasma thrusters in space technologies. Argon, a gas by far less costly, is widely used in other technologies, but a much lower efficiency of ionization, as obtained for example in closed electron drift thrusters, prevents its use in R&D programs and development of space thrusters. This paper shows that a drastic increase in argon ionization can be obtained in a low power thruster when only a few percent of xenon are added in the argon flow. Besides the increase in the ion beam current in the plume generated by the thruster, a net increase in the ion kinetic energy is observed. These two features are of interest in terms of thrust efficiency. These results, obtained for a small size closed electron drift thruster, could be even more spectacular for higher power devices, suggesting further investigations for space propulsion and/or ion source applications.

Published
2019
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