20 results on '"Morandotti, R."'
Search Results
2. Stability of laser cavity-solitons for metrological applications.
- Author
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Cutrona, A., Rowley, M., Bendahmane, A., Cecconi, V., Peters, L., Olivieri, L., Little, B. E., Chu, S. T., Stivala, S., Morandotti, R., Moss, D. J., Totero Gongora, J. S., Peccianti, M., and Pasquazi, A.
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MODE-locked lasers , *LASER pumping , *FIBER lasers , *LASERS , *FREQUENCY stability , *TRANSPORTATION rates - Abstract
Laser cavity-solitons can appear in systems comprised of a nonlinear microcavity nested within an amplifying fiber loop. These states are robust and self-emergent and constitute an attractive class of solitons that are highly suitable for microcomb generation. Here, we present a detailed study of the free-running stability properties of the carrier frequency and repetition rate of single solitons, which are the most suitable states for developing robust ultrafast and high repetition rate comb sources. We achieve free-running fractional stability on both optical carrier and repetition rate (i.e., 48.9 GHz) frequencies on the order of 1 0 − 9 for a 1 s gate time. The repetition rate results compare well with the performance of state-of-the-art (externally driven) microcomb sources, and the carrier frequency stability is in the range of performance typical of modern free-running fiber lasers. Finally, we show that these quantities can be controlled by modulating the laser pump current and the cavity length, providing a path for active locking and long-term stabilization. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Correlation between surface chemistry and ion energy dependence of the etch yield in multicomponent oxides etching.
- Author
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Bérubé, P.-M., Poirier, J.-S., Margot, J., Stafford, L., Ndione, P. F., Chaker, M., and Morandotti, R.
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PLASMA etching , *SURFACE chemistry , *OXIDES , *SPUTTERING (Physics) , *ION migration & velocity - Abstract
The influence of surface chemistry in plasma etching of multicomponent oxides was investigated through measurements of the ion energy dependence of the etch yield. Using pulsed-laser-deposited CaxBa(1-x)Nb2O6 (CBN) and SrTiO3 thin films as examples, it was found that the etching energy threshold shifts toward values larger or smaller than the sputtering threshold depending on whether or not ion-assisted chemical etching is the dominant etching pathway and whether surface chemistry is enhancing or inhibiting desorption of the film atoms. In the case of CBN films etched in an inductively coupled Cl2 plasma, it is found that the chlorine uptake is inhibiting the etching reaction, with the desorption of nonvolatile NbCl2 and BaCl2 compounds being the rate-limiting step. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
4. Microstructural and optical properties of Ba0.5Sr0.5TiO3 thin film deposited by pulsed laser deposition for low loss waveguide applications.
- Author
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Gaidi, M., Chaker, M., Ndione, P. F., Morandotti, R., and Bessaïs, B.
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BARIUM , *STRONTIUM , *TITANATES , *PULSED laser deposition , *MICROSTRUCTURE , *ATOMIC force microscopy - Abstract
Barium strontium titanate (Ba0.5Sr0.5TiO3 or BST) films were grown on SiO2/Si substrate by means of a reactive pulsed laser deposition technique. The microstructural and surface morphology of BST films were characterized by x-ray diffraction, scanning electron microscopy, and atomic force microscopy. Films deposited at 400 °C were found to be amorphous and present wide cracks. The crystallization of the films was induced by annealing at 600 °C. The BST films deposited at 550 °C present a cubic perovskite structure with a dense and smooth surface. The optical constants (n and k as a function of wavelength) of the films were obtained using variable angle spectroscopic ellipsometry in the UV-vis-NIR regions. Microfabricated BST/SiO2/Si ridged waveguides were patterned using UV photolithography and high-density plasma etching. The propagation and loss characteristics at the telecommunication wavelength of 1.55 μm were investigated using top-view scattering and Fabry-Pérot resonance methods. For specific ridge widths, we obtained single-mode propagation with relatively low losses (∼1 dB/cm), thereby demonstrating the strong potential of BST films for guided-wave components for advanced optical integrated systems. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
5. Terahertz pulse generation from bulk GaAs by a tilted-pulse-front excitation at 1.8 µm.
- Author
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Blanchard, F., Schmidt, B. E., Ropagnol, X., Thiré, N., Ozaki, T., Morandotti, R., Cooke, D. G., and Légaré, F.
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GALLIUM arsenide , *ENERGY conversion , *BROADBAND communication systems , *BANDWIDTH research , *CRYSTALS - Abstract
We report on terahertz (THz) generation via optical rectification in a room temperature gallium arsenide (GaAs) crystal pumped at a wavelength of 1.8 lm using a modified tilted-pulse-front scheme, leading to a 0.05% energy conversion efficiency. The spectral content of the measured THz pulses, ranging from 0.1 to 3 THz, confirmed a good broadband phase matching between the pump and the THz pulses over several millimeters (>20mm) in a semi-insulating h110i cut bulk GaAs crystal. Our findings also suggest that the pump-to-THz conversion efficiency can be further increased by using a pump source with a narrower bandwidth. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
6. Excitation of multiple trapped-eigenmodes in terahertz metamolecule lat.
- Author
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Born, N., Al-Naib, I., Jansen, C., Ozaki, T., Morandotti, R., and Koch, M.
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EXCITATION spectrum , *CRYSTAL lattices , *DISPERSIVE interactions , *THIN film sensors , *EIGENANALYSIS - Abstract
We report on the excitation of sharp Fano-like resonances in lattices of metamolecules composed of two differing types of metaatoms. The proposed structures exhibit modes originating from the individual metaatoms as well as a very sharp mode from the collective excitation of the metamolecule lattice as a whole. Next-generation thin film sensors (e.g., for bio/chemical hazard detectors) could especially benefit from such artificial materials. Having multiple modes at different spectral positions enables the characterization of dispersive materials, while the high Q-factors of the eigenmodes lead to a very high sensitivity. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
7. Spectrally resolved wave-mixing between near- and far-infrared pulses in gas.
- Author
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Clerici, M, Faccio, D, Caspani, L, Peccianti, M, Yaakobi, O, Schmidt, B E, Shalaby, M, Vidal, F, Légaré, F, Ozaki, T, and Morandotti, R
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INTERMODULATION , *GASES , *WAVELENGTHS , *SUBMILLIMETER waves , *ELECTRIC fields , *OSCILLATIONS - Abstract
We investigate the nonlinear wave-mixing in gases between intense, short optical pulses and long-wavelength fields (mid infrared and terahertz). We show numerically that the beating between the sum- and difference-frequency generation components can be isolated in the spectrogram of the interaction, and can be used to sample the electric field oscillations of the long-wavelength pulses. This, in turn, could be employed as a possible characterization method that provides information on the real electric field amplitude. Our numerical model is supported by spectrally resolved measurements of the four-wave mixing signals obtained from the interaction of intense, single-cycle terahertz fields (λ > 15 μm) and optical pulses (λ ≃ 800 nm, 50 fs duration) in air. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
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8. Wideband THz Time Domain Spectroscopy based on Optical Rectification and Electro-Optic Sampling.
- Author
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Tomasino, A., Parisi, A., Stivala, S., Livreri, P., Cino, A. C., Busacca, A. C., Peccianti, M., and Morandotti, R.
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SPECTRUM analysis , *TIME-domain analysis , *TIME-frequency analysis , *SIMULATION methods & models , *ELECTRO-optical effects - Abstract
We present an analytical model describing the full electromagnetic propagation in a THz time-domain spectroscopy (THz-TDS) system, from the THz pulses via Optical Rectification to the detection via Electro Optic-Sampling. While several investigations deal singularly with the many elements that constitute a THz-TDS, in our work we pay particular attention to the modelling of the time-frequency behaviour of all the stages which compose the experimental set-up. Therefore, our model considers the following main aspects: (i) pump beam focusing into the generation crystal; (ii) phase-matching inside both the generation and detection crystals; (iii) chromatic dispersion and absorption inside the crystals; (iv) Fabry-Perot effect; (v) diffraction outside, i.e. along the propagation, (vi) focalization and overlapping between THz and probe beams, (vii) electro-optic sampling. In order to validate our model, we report on the comparison between the simulations and the experimental data obtained from the same set-up, showing their good agreement. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
9. Second Harmonic Generation in AlGaAs Nanowaveguides.
- Author
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Rutkowska, K. A., Duchesne, D., Volatier, M., Arès, R., Aimez, V., and Morandotti, R.
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WAVEGUIDES , *WAVELENGTHS , *LIGHT sources , *PHOTONICS , *OPTOELECTRONICS , *FIBER optics - Abstract
In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 μm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic generation. Particular interest has been dedicated to the effective conversion of optical signals from 1520-1600 nm (the third telecom window) down to 760-800 nm. We demonstrate that the output wavelength (resulting from modal phase-matching) can be dynamically tuned by proper adjustment of the temperature and/or geometrical parameters of the waveguides. In addition, by changing the waveguide width it is also possible to modify the device dispersion characteristics, giving the possibility to work in the region of anomalous dispersion and thus allowing for the generation of temporal solitons. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
10. Second Harmonic Generation in AlGaAs Nanowaveguides.
- Author
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Rutkowska, K. A., Duchesne, D., Volatier, M., Arès, R., Aimez, V., and Morandotti, R.
- Subjects
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SECOND harmonic generation , *WAVEGUIDES , *WAVELENGTHS , *PHOTONICS , *SOLITONS - Abstract
In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 μm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic generation. Particular interest has been dedicated to the effective conversion of optical signals from 1520-1600 nm (the third telecom window) down to 760-800 nm. We demonstrate that the output wavelength (resulting from modal phase-matching) can be dynamically tuned by proper adjustment of the temperature and/or geometrical parameters of the waveguides. In addition, by changing the waveguide width it is also possible to modify the device dispersion characteristics, giving the possibility to work in the region of anomalous dispersion and thus allowing for the generation of temporal solitons. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
11. Effective Mass Anisotropy of Hot Electrons in Nonparabolic Conduction Bands of n-Doped InGaAs Films Using Ultrafast Terahertz Pump-Probe Techniques.
- Author
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Blanchard, F., Golde, D., Su, F. H., Razzari, L., Sharma, G., Morandotti, R., Ozaki, T., Reid, M., Kira, M., Koch, S. W., and Hegmann, F. A.
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ANISOTROPY , *HOT carriers , *CONDUCTION bands , *TERAHERTZ technology , *EFFECTIVE mass (Physics) , *SEMICONDUCTOR doping , *SEMICONDUCTOR films - Abstract
The anisotropic effective mass of energetic electrons in an isotropic, nonparabolic conduction band is revealed using ultrafast THz-pump-THz-probe techniques in a n-doped InGaAs semiconductor thin film. A microscopic theory is applied to identify the origin of the observed anisotropy and to show that the self-consistent light-matter coupling contributes significantly to the THz response. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
12. CMOS-compatible integrated optical hyper-parametric oscillator.
- Author
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Razzari, L., Duchesne, D., Ferrera, M., Morandotti, R., Chu, S., Little, B. E., and Moss, D. J.
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LASER cavity resonators , *HUMAN fingerprints , *BROADBAND dielectric spectroscopy , *TELECOMMUNICATION , *OSCILLATING chemical reactions - Abstract
Integrated multiple-wavelength laser sources, critical for important applications such as high-precision broadband sensing and spectroscopy, molecular fingerprinting, optical clocks and attosecond physics, have recently been demonstrated in silica and single-crystal microtoroid resonators using parametric gain. However, for applications in telecommunications and optical interconnects, analogous devices compatible with a fully integrated platform do not yet exist. Here, we report a fully integrated, CMOS-compatible, multiple-wavelength source. We achieve optical ‘hyper-parametric’ oscillation in a high-index silica-glass microring resonator with a differential slope efficiency above threshold of 7.4% for a single oscillating mode, a continuous-wave threshold power as low as 54 mW, and a controllable range of frequency spacing from 200 GHz to more than 6 THz. The low loss, design flexibility and CMOS compatibility of this device will enable the creation of multiple-wavelength sources for telecommunications, computing, sensing, metrology and other areas. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
13. Low-power continuous-wave nonlinear optics in doped silica glass integrated waveguide structures.
- Author
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Ferrera, M., Razzari, L., Duchesne, D., Morandotti, R., Yang, Z., Liscidini, M., Sipe, J. E., Chu, S., Little, B. E., and Moss, D. J.
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SILICA , *WAVEGUIDES , *FIBER optic equipment , *OPTICAL communications , *SIGNAL processing equipment ,DESIGN & construction - Abstract
Photonic integrated circuits are a key component of future telecommunication networks, where demands for greater bandwidth, network flexibility, and low energy consumption and cost must all be met. The quest for all-optical components has naturally targeted materials with extremely large nonlinearity, including chalcogenide glasses and semiconductors, such as silicon and AlGaAs (ref. 4). However, issues such as immature fabrication technology for chalcogenide glass and high linear and nonlinear losses for semiconductors motivate the search for other materials. Here we present the first demonstration of nonlinear optics in integrated silica-based glass waveguides using continuous-wave light. We demonstrate four-wave mixing, with low (5 mW) continuous-wave pump power at λ = 1,550 nm, in high-index, doped silica glass ring resonators. The low loss, design flexibility and manufacturability of our device are important attributes for low-cost, high-performance, nonlinear all-optical photonic integrated circuits. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
14. OBSERVATION OF ONE- AND TWO-DIMENSIONAL DISCRETE SURFACE SPATIAL SOLITONS.
- Author
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SUNTSOV, S., MAKRIS, K. G., SIVILOGLOU, G. A., IWANOW, R., SCHIEK, R., CHRISTODOULIDES, D. N., STEGEMAN, G. I., MORANDOTTI, R., YANG, H., SALAMO, G., VOLATIER, M., AIMEZ, V., ARÈS, R., SOREL, M., MIN, Y., SOHLER, W., WANG, XIAOSHENG, BEZRYADINA, ANNA, and CHEN, ZHIGANG
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DISCRETE groups , *NONLINEAR theories , *WAVEGUIDES , *SOLITONS , *LITHIUM - Abstract
The recent theoretical predictions and experimental observations of discrete surface solitons propagating along the interface between a one- or two-dimensional continuous medium and a one- or two-dimensional waveguide array are reviewed. These discrete solitons were found in second order (periodically poled lithium niobate) and third order nonlinear media, including AlGaAs, photorefractive media and glass, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
15. Asymmetric spectrum evolution of high power short pulses in AlGaAs waveguides
- Author
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Modotto, D., Mondia, J.P., Linden, S., Tan, H.W., Morandotti, R., Kleckner, T.C., Locatelli, A., De Angelis, C., van Driel, H.M., Stanley, C.R., and Aitchison, J.S.
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SPECTRUM analysis , *WAVEGUIDES , *ELECTRICAL conductors , *ELECTRIC waves - Abstract
Abstract: We measured the self-phase modulation spectra at the output of deep-etched AlGaAs waveguides. The light source was an OPO laser system providing 250fs long pulses, at wavelengths around 1520nm, with a peak power as high as 1kW. FROG measurements of the OPO pulses reveal their asymmetric shape. The multi-peak spectra, observed at the waveguide output, show a dramatic asymmetry and a power shift towards short wavelengths. The interplay between the Kerr non-linearity, dispersion and self-steepening amplifies the initial slight asymmetry of the injected spectrum. Experimental results compare favourably with the numerical solution of the generalized non-linear Schrödinger equation. [Copyright &y& Elsevier]
- Published
- 2005
- Full Text
- View/download PDF
16. Hanbury Brown and Twiss correlations of Anderson localized waves.
- Author
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Lahini, Y., Bromberg, Y., Shechtman, Y., Szameit, A., Christodoulides, D. N., Morandotti, R., and Silberberg, Y.
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PHOTONICS , *OPTICS , *INTEGRATED optics , *SCATTERING (Physics) , *PHYSICS - Abstract
When light waves propagate through disordered photonic lattices, they can eventually become localized due to multiple scattering effects. Here we show experimentally that while the evolution and localization of the photon density distribution is similar in the two cases of diagonal and off-diagonal disorder, the density-density correlation carries a distinct signature of the type of disorder. We show that these differences reflect a symmetry in the spectrum and eigenmodes that exists in off-diagonally disordered lattices but is absent in lattices with diagonal disorder. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
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17. Wave interactions and wave-structure scattering in nonlinear patterned waveguides
- Author
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Linzon, Yoav, Malomed, Boris A., Zaezjev, Michael, Morandotti, R., Volatier-Ravat, Maite, Aimez, Vincent, Ares, Richard, and Bar-Ad, Shimshon
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WAVE mechanics , *SCATTERING (Physics) , *WAVEGUIDES , *NONLINEAR theories , *SOLITONS , *DIFFRACTION patterns , *POTENTIAL theory (Physics) , *ELECTROMAGNETISM - Abstract
Abstract: The nonlinear interactions between discrete optical solitons that propagate in different regimes of diffraction, and the nonlinear scattering of dispersive waves by local optical potentials, were studied experimentally. It is well known in electromagnetism that when linear coherent waves meet they interfere without interactions. Linear waves also scatter through local optical structures without exchanging any power with guided and anti-guided modes of these structures. When a focusing Kerr nonlinearity is present, linearly inhibited phenomena, which break these rules, are shown to exist. Our studies were performed with Silica glass and semiconductor AlGaAs nonlinear planar modulated waveguides, excited by ultra-short pulses in the near infrared spectral regime. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
18. Pockels response in calcium barium niobate thin films.
- Author
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Helsten, R., Razzari, L., Ferrera, M., Ndione, P. F., Gaidi, M., Durand, C., Chaker, M., and Morandotti, R.
- Subjects
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CALCIUM , *THIN films , *SURFACES (Technology) , *SOLID state electronics , *THICK films - Abstract
The electro-optical response of calcium barium niobate ferroelectric thin films is characterized using a single beam setup in reflection geometry. Clear evidence of a Pockels response together with an r33 coefficient as high as 130 pm/V is found. This large value and the high Curie temperature of the material under study (>250 °C) can be considered as a promising feature for the fabrication of hybrid, integrated electro-optical modulators working at a high repetition rate. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
19. Microfabricated SrTiO3 ridge waveguides.
- Author
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Gaidi, M., Stafford, L., Margot, J., Chaker, M., Morandotti, R., and Kulishov, M.
- Subjects
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MICROFABRICATION , *WAVEGUIDES , *STRONTIUM compounds , *PULSED laser deposition , *SCATTERING (Physics) , *TELECOMMUNICATION - Abstract
We report the microfabrication and characterization of SrTiO3/SiO2/Si ridge waveguides. SrTiO3 films are very attractive for optical integrated systems as they present a high transparency in the visible and infrared wavelength range as well as a relatively high refractive index. In this work, SrTiO3 films were grown by means of a reactive pulsed-laser-deposition technique and patterned using UV photolithography and high-density plasma etching. Propagation and loss characteristics at the telecommunication wavelength of 1.55 μm were investigated using top-view scattering and Fabry-Perot resonance methods. For specific ridge widths, we obtained single-mode propagation with relatively low losses (∼1.5 dB/cm), thereby demonstrating the strong potential of SrTiO3 films for guided-wave components for advanced optical integrated systems. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
20. Nonlinear transmission properties of a deep-etched microstructured waveguide.
- Author
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Linden, S., Mondia, J. P., Van Driel, H. M., Kleckner, T. C., Stanley, C. R., Modotto, D., Locatelli, A., De Angelis, C., Morandotti, R., and Aitchison, J. S.
- Subjects
- *
NONLINEAR systems , *MICROWAVE transmission lines , *WAVEGUIDES , *ELECTRIC waves , *PULSE circuits , *ELECTRONIC modulation , *ELECTRIC filters - Abstract
In this letter, we investigate the nonlinear transmission properties of a one-dimensional micro-structured A1GaAs waveguide with a defect in the middle of a deep-etched Bragg grating. The transmitted spectrum depends on the spectral position of the incident pulse spectrum with respect to the defect mode as well as the pulse intensity. These findings are very important for all optical switching applications and can be explained by the interplay between self-phase modulation of the incident 250 fs pulses in the waveguide and the filtering properties of the defect mode. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
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