Now showing items 1-20 of 141

    • Absorption enhancement of molecules in the weak plasmon-exciton coupling regime 

      Balci, S.; Karademir, E.; Kocabas, C.; Aydınlı, Atilla (Optical Society of American (OSA), 2014)
      We report on the experimental and theoretical investigations of enhancing the optical absorption of organic molecules in the weak plasmon-exciton coupling regime. A metal-organic hybrid structure consisting of dye molecules ...
    • Alteration of spontaneous emission in hydrogenated amorphous silicon nitride microcavities 

      Serpengüzel, A.; Aydınlı, Atilla; Bek, A. (Elsevier BV, 1998)
      A Fabry-Perot microcavity is used for the alteration of the spontaneous emission spectrum in hydrogenated amorphous silicon nitride. The modified photon density of states of the Fabry-Perot microcavity are responsible for ...
    • Anharmonic line shift and linewidth of the Raman modes in TlInS2 layered crystals 

      Yuksek, N. S.; Gasanly, N. M.; Aydınlı, Atilla (John Wiley & Sons Ltd., 2004)
      The temperature dependence of the unpolarized Raman spectra from TlInS 2 layered crystal was measured between 10 and 300 K. The analysis of the experimental data showed that the temperature dependences of wavenumbers and ...
    • Anharmonicity in GaTe layered crystals 

      Aydınlı, Atilla; Gasanly, N. M.; Uka, A.; Efeoglu, H. (Wiley-VCH Verlag GmbH & Co. KGaA, 2002)
      The temperature dependencies (10-300 K) of seven Raman-active mode frequencies in layered semiconductor gallium telluride have been measured in the frequency range from 25 to 300 cm -1. Softening and broadening of the ...
    • Anharmonicity of zone-center optical phonons: Raman scattering spectra of GaSe0.5S0.5 layered crystal 

      Gasanly, N. M.; Aydınlı, Atilla; Kocabas, C.; Özkan H. (IOPscience, 2002)
      The temperature dependencies (10-300 K) of the eight Raman-active mode frequencies and linewidths in GaSe0.5S0.5 layered crystal have been measured in the frequency range from 10 to 320 cm-1. We observed softening and ...
    • Atomic layer deposited Al 2O 3 passivation of type II InAs/GaSb superlattice photodetectors 

      Salihoğlu, Ömer; Muti, Abdullah; Kutluer, Kutlu; Tansel, T.; Turan, R.; Kocabaş, Coşkun; Aydınlı, Atilla (AIP, 2012)
      Taking advantage of the favorable Gibbs free energies, atomic layer deposited (ALD) aluminum oxide (Al 2O 3) was used as a novel approach for passivation of type II InAs/GaSb superlattice (SL) midwave infrared (MWIR) single ...
    • Characterization of multilayer self-organized InAs quantum dot embedded waveguides at 1.3 and 1.5 μm 

      Akca, B. Imran; Dana, Aykutlu; Aydınlı, Atilla; Rossetti, M.; Li L.; Fiore, A.; Dagli, N. (IEEE, 2007)
      In this paper, we characterized the electro-optic coefficient and loss of multilayer InAs quantum dot laser structures at 1309 and 1515 nm. Quantum dot waveguides were grown by molecular beam epitaxy, where the active ...
    • Characterization of thermally poled germanosilicate thin films 

      Ozean, A.; Digonnet, M.J.F.; Kino G.S.; Ay F.; Aydınlı, Atilla (Optical Society of American (OSA), 2004)
      We report measurements of the nonlinearity profile of thermally poled low-loss germanosilicate films deposited on fused-silica substrates by PECVD, of interest as potential electro-optic devices. The profiles of films grown ...
    • Charge retention in quantized energy levels of nanocrystals 

      Dâna, A.; Akça, I.; Ergun, O.; Aydınlı, Atilla; Turan, R.; Finstad, T. G. (Elsevier B.V., 2007)
      Understanding charging mechanisms and charge retention dynamics of nanocrystal (NC) memory devices is important in optimization of device design. Capacitance spectroscopy on PECVD grown germanium NCs embedded in a silicon ...
    • Chemical and topographical modification of PHBV surface to promote osteoblast alignment and confinement 

      Kenar, H.; Kocabas, A.; Aydınlı, Atilla; Hasirci, V. (John Wiley & Sons, Inc., 2008)
      Proper cell attachment and distribution, and thus stronger association in vivo between a bone implant and native tissue will improve the success of the implant. In this study, the aim was to achieve promotion of attachment ...
    • A Compact Silicon-on-insulator Polarization Splitter 

      Kiyat, I.; Aydınlı, Atilla; Dagli, N. (IEEE, 2005)
      A compact directional coupler-based polarization splitter is designed and realized using silicon-on-insulator (SOI) waveguides. Even though silicon does not have any material birefringence, the high index contrast obtained ...
    • Comparative investigation og hydrogen bonding in silicon based PECVD grown dielectrics for optical 

      Ay, F.; Aydınlı, Atilla (Elsevier, 2004-06)
      Silicon oxide, silicon nitride and silicon oxynitride layers were grown by a PECVD technique. The resulting refractive indices of the layers varied between 1.47 and 1.93. The compositional properties of the layers were ...
    • A Comparative Passivation Study for InAs / GaSb Pin Superlattice Photodetectors 

      Salihoglu, O.; Muti, A.; Aydınlı, Atilla (IEEE Institute of Electrical and Electronics Engineers, 2013-08)
      In the quest to find ever better passivation techniques for infrared photodetectors, we explore several passivation layers using atomic layer deposition (ALD). We compare the impact of these layers on detectors fabricated ...
    • Comparison of electron and hole charge-discharge dynamics in germanium nanocrystal flash memories 

      Akça, İmran B.; Dâna, Aykutlu; Aydınlı, Atilla; Turan, R. (AIP Publishing, 2008-02)
      Electron and hole charge and discharge dynamics are studied on plasma enhanced chemical vapor deposition grown metal-oxide-silicon germanium nanocrystal flash memory devices. Electron and hole charge and discharge currents ...
    • Contact guidance enhances the quality of a tissue engineered corneal stroma 

      Vrana, E.; Builles, N.; Hindie, M.; Damour O.; Aydınlı, Atilla; Hasirci, V. (John Wiley & Sons, Inc., 2008)
      Corneal stroma is a very complex structure, composed of 200 lamellae of oriented collagen fibers. This highly complex nature of cornea is known to be important for its transparency and mechanical integrity. Thus, an ...
    • Cornea engineering on polyester carriers 

      Zorlutuna, P.; Tezcaner, A.; Kiyat, I.; Aydınlı, Atilla; Hasirci, V. (John Wiley & Sons, Inc., 2006)
      In this study, biodegradable polyester based carriers were designed for tissue engineering of the epithelial and the stromal layers of the cornea, and the final construct was tested in vitro. In the construction of the ...
    • Correlation of TEM data with confined phonons to determine strain and size of Ge nanocrystals embedded in SixNy matrix 

      Bahariqushchi, Rahim; Gündoğdu, Sinan; Aydınlı, Atilla (Academic Press, 2017)
      Models that use phonon confinement fail to provide consistent results for nanocrystal sizes in differing dielectric matrices due to varying stress experienced by nanocrystals in different dielectric environments. In cases ...
    • Coupled plasmonic cavities on moire surfaces 

      Balcı, Sinan; Karabıyık, Mustafa; Kocabaş, Aşkın; Kocabaş, Coşkun; Aydınlı, Atilla (Springer, 2010-08)
      Surface plasmon polariton (SPP) waveguides formed by coupled plasmonic cavities on metallic Moire surfaces have been investigated both experimentally and numerically. The Moire surface, fabricated by interference lithography, ...
    • Critical coupling in plasmonic resonator arrays 

      Balci, S.; Kocabas, C.; Aydınlı, Atilla (Optical Society of America, 2011)
      We report critical coupling of electromagnetic waves to plasmonic cavity arrays fabricated on Moire surfaces. Dark field plasmon microscopy imaging and polarization dependent spectroscopic reflection measurements reveal ...
    • Crystallization of Ge in SiO2 matrix by femtosecond laser processing 

      Salihoglu, O.; Kürüm, U.; Yaglioglu, H. G.; Elmali, A.; Aydınlı, Atilla (American Vacuum Society, 2012-01-19)
      Germanium nanocrystals embedded in a siliconoxide matrix has been fabricated by single femtosecond laser pulse irradiation of germanium doped SiO2 thin films deposited with plasma enhanced chemical vapor deposition. SEM ...