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154 results on '"Aydinli, Atilla"'

1. Charge Retention in Quantized Energy Levels of Nanocrystals

Author

Dana, Aykutlu, Akca, Imran, Ergun, Orcun, Aydinli, Atilla, Turan, Rasit, and Finstad, Terje

Subjects
Condensed Matter - Other Condensed Matter
Abstract

Understanding charging mechanisms and charge retention dynamics of nanocrystal memory devices is important in optimization of device design. Capacitance spectroscopy on PECVD grown germanium nanocrystals embedded in a silicon oxide matrix was performed. Dynamic measurements of discharge dynamics are carried out. Charge decay is modelled by assuming storage of carriers in the ground states of nanocrystals and that the decay is dominated by direct tunnelling. Discharge rates are calculated using the theoretical model for different nanocrystal sizes and densities and are compared with experimental data. Experimental results agree well with the proposed model and suggest that charge is indeed stored in the quantized energy levels of the nanocrystals., Comment: 10 pages, 5 figures

Published
2006
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4. Large Rabi Splitting Of Mixed Plasmon-Exciton States In Small Plasmonic Moire Cavities

Author

Ates, Simge, Karademir, Ertugrul, Balci, Sinan, Kocabas, Coskun, and Aydinli, Atilla

Subjects
Physics::Accelerator Physics, Physics::Optics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Abstract

We report on exciton-plasmon coupling in metallic moire cavities, both numerically and experimentally. Moire cavities fabricated using double exposure laser interference lithography were filled with a molecular dye, J-aggregate. Polarization-dependent spectroscopic reflection measurements supported by simulations reveal strong coupling of organic dye excitons with cavity modes of the plasmonic moire cavities. An anti-crossing at zero detuning, a clear indication of strong coupling, has been observed when the excitonic absorption band resonates with the cavity mode. LargeRabi splitting energies owing to the strong coupling of plasmons and excitons are clearly observed. (C) 2020 Optical Society of America

Published
2020

5. Supplementary document for Large Rabi splitting of mixed plasmon-exciton states in small plasmonic Moiré cavities - 4828542.pdf

Author

Aydinli, Atilla, Ates, Simge, SINAN BALCI, Coskun Kocabas, and Ertugrul Karademir

Subjects
Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, Physics::Optics
Abstract

Schematic representration of SPP dispersion, Electric field distribution of plasmonic cavities, Reflection from the cavity mode, Exciton-plasmon coupling on a Moiré Surfaces.

Published
2020
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7. X-ray photoelectron spectroscopic analysis of Si nanoclusters in SiO(sub 2) matrix

Author

Dane, Aykutlu, Demirok, U. Korcan, Suzer, Sefik, and Aydinli, Atilla

Subjects
Photoelectron spectroscopy -- Usage, Clusters (Chemistry) -- Structure, Chemical vapor deposition -- Methods, Chemicals, plastics and rubber industries
Abstract

X-ray photoelectron spectroscopy (XPS) is used to analyze the silicon nanoclusters Si(nc) in a SiO(sub 2) matrix prepared by the plasma-enhanced chemical vapor deposition technique. The results show no measurable binding energy difference between the corresponding Si2(sub p) peaks and hence suggest that the differential charging is the greatest obstacle to extract the size-dependent binding energy shifts axis XPS.

Published
2006

15. Light harvesting with Ge quantum dots embedded in SiO2 or Si3N4.

Author

Cosentino, Salvatore, Ozen, Emel Sungur, Raciti, Rosario, Mio, Antonio M., Nicotra, Giuseppe, Simone, Francesca, Crupi, Isodiana, Turan, Rasit, Terrasi, Antonio, Aydinli, Atilla, and Mirabella, Salvo

Subjects
GERMANIUM, QUANTUM dots, THIN film research, TRANSMISSION electron microscopy, RAMAN spectroscopy
Abstract

Germanium quantum dots (QDs) embedded in SiO2 or in Si3N4 have been studied for light harvesting purposes. SiGeO or SiGeN thin films, produced by plasma enhanced chemical vapor deposition, have been annealed up to 850 °C to induce Ge QD precipitation in Si based matrices. By varying the Ge content, the QD diameter can be tuned in the 3-9 nm range in the SiO2 matrix, or in the 1-2 nm range in the Si3N4 matrix, as measured by transmission electron microscopy. Thus, Si3N4 matrix hosts Ge QDs at higher density and more closely spaced than SiO2 matrix. Raman spectroscopy revealed a higher threshold for amorphous-to-crystalline transition for Ge QDs embedded in Si3N4 matrix in comparison with those in the SiO2 host. Light absorption by Ge QDs is shown to be more effective in Si3N4 matrix, due to the optical bandgap (0.9-1.6 eV) being lower than in SiO2 matrix (1.2-2.2 eV). Significant photoresponse with a large measured internal quantum efficiency has been observed for Ge QDs in Si3N4 matrix when they are used as a sensitive layer in a photodetector device. These data will be presented and discussed, opening new routes for application of Ge QDs in light harvesting devices. [ABSTRACT FROM AUTHOR]

Published
2014
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19. Femtosecond laser crystallization of amorphous Ge.

Author

Salihoglu, Omer, Kürüm, Ulaş, Gul Yaglioglu, H., Elmali, Ayhan, and Aydinli, Atilla

Subjects
GERMANIUM, RAMAN effect, CHEMICAL vapor deposition, MAGNETIC properties of amorphous substances, LASER ablation, ATOMIC force microscopy
Abstract

Ultrafast crystallization of amorphous germanium (a-Ge) in ambient has been studied. Plasma enhanced chemical vapor deposition grown a-Ge was irradiated with single femtosecond laser pulses of various durations with a range of fluences from below melting to above ablation threshold. Extensive use of Raman scattering has been employed to determine post solidification features aided by scanning electron microscopy and atomic force microscopy measurements. Linewidth of the Ge optic phonon at 300 cm-1 as a function of laser fluence provides a signature for the crystallization of a-Ge. Various crystallization regimes including nanostructures in the form of nanospheres have been identified. [ABSTRACT FROM AUTHOR]

Published
2011
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20. Prism coupling technique investigation of elasto-optical properties of thin polymer films.

Author

Ay, Feridun, Kocabas, Askin, Kocabas, Coskun, Aydinli, Atilla, and Agan, Sedat

Subjects
POLYMERS, THIN films, SURFACES (Technology), METHYL methacrylate, SOLID state electronics, MACROMOLECULES
Abstract

The use of thin polymer films in optical planar integrated optical circuits is rapidly increasing. Much interest, therefore, has been devoted to characterizing the optical and mechanical properties of thin polymer films. This study focuses on measuring the elasto-optical properties of three different polymers; polystyrene, polymethyl-methacrylate, and benzocyclobutane. The out-of-plane elastic modulus, refractive index, film thickness, and birefringence of thin polymer films were determined by means of the prism coupling technique. The effect of the applied stress on the refractive index and birefringence of the films was investigated. Three-dimensional finite element method analysis was used so as to obtain the principal stresses for each polymer system, and combining them with the stress dependent refractive index measurements, the elasto-optic coefficients of the polymer films were determined. It was found that the applied stress in the out-of-plane direction of the thin films investigated leads to negative elasto-optic coefficients, as observed for all the three thin polymer films. [ABSTRACT FROM AUTHOR]

Published
2004
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30. Light harvesting with Ge quantum dots embedded in SiO2 or Si3N4

Author

Cosentino, Salvatore, primary, Sungur Ozen, Emel, additional, Raciti, Rosario, additional, Mio, Antonio M., additional, Nicotra, Giuseppe, additional, Simone, Francesca, additional, Crupi, Isodiana, additional, Turan, Rasit, additional, Terrasi, Antonio, additional, Aydinli, Atilla, additional, and Mirabella, Salvo, additional

Published
2014
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