Now showing items 1-11 of 11

    • BilKristal 4.0: A tool for crystal parameters extraction and defect quantification 

      Okuyan, E.; Okuyan, C. (Elsevier, 2015)
      In this paper, we present a revised version of BilKristal 3.0 tool. Raycast screenshot functionality is added to provide improved visual analysis. We added atomic distance analysis functionality to assess crystalline ...
    • Coupled optical microcavities in one-dimensional photonic bandgap structures 

      Bayindir, M.; Kural, C.; Ozbay, E. (Institute of Physics Publishing, 2001)
      We present a detailed theoretical and experimental study of the evanescent coupled optical microcavity modes in one-dimensional photonic bandgap structures. The coupled-cavity samples are fabricated by depositing alternating ...
    • Guiding and bending of photons via hopping in three-dimensional photonic crystals 

      Bayindir, M.; Temelkuran, B.; Ozbay, E. (IEEE, Piscataway, NJ, United States, 2000)
      For the past decade, photonic crystals, also known as photonic bandgap (PBG) materials, have inspired great interest because of their novel scientific and engineering applications such as the inhibition of spontaneous ...
    • Laser-micromachined millimeter-wave photonic band-gap cavity structures 

      Özbay, E.; Tuttle, G.; McCalmont, J. S.; Sigalas, M.; Biswas, R.; Soukoulis, C. M.; Ho, K. M. (American Institute of Physics, 1995)
      We have used laser-micromachined alumina substrates to build a three-dimensional photonic band-gap crystal. The rod-based structure has a three-dimensional full photonic band gap between 90 and 100 GHz. The high resistivity ...
    • Low-temperature phase transitions in TlGaS2 layer crystals 

      Aydinli, A.; Ellialtioǧlu, R.; Allakhverdiev, K. R.; Ellialtioǧlu, S.; Gasanly, N. M. (Pergamon Press, 1993)
      Polarized Raman scattering spectra of TlGaS2 layer crystals have been studied for the first time as a function of temperature between 8.5 and 295 K. No evidence for a soft mode behaviour has been found. The anomalies ...
    • MaterialVis: material visualization tool using direct volume and surface rendering techniques 

      Okuyan, E.; Güdükbay U.; Bulutay, C.; Heinig, Karl-Heinz (Elsevier Inc., 2014)
      Visualization of the materials is an indispensable part of their structural analysis. We developed a visualization tool for amorphous as well as crystalline structures, called MaterialVis. Unlike the existing tools, ...
    • Reflection properties and defect formation in metallic photonic crystals 

      Ozbay, E.; Temelkuran, B.; Sigalas, M.; Tuttle, G.; Soukoulis, C. M.; Ho, K. M. (IEEE, Piscataway, NJ, United States, 1998)
      The reflection properties of layer-by-layer metallic photonic crystals were investigated using metallic photonic crystals with simple-tetragonal (st) structure. The observed properties were used to predict defect formation ...
    • Reflection properties and defect formation in photonic crystals 

      Özbay, E.; Temelkuran, B. (A I P Publishing LLC, 1996-08-05)
      We have investigated the surface reflection properties of a layer-by-layer photonic crystal. By using a Fabry-Perot resonant cavity analogy along with the reflection-phase information of the photonic crystal, we predicted ...
    • Temperature-dependent Raman scattering spectra of ε-GaSe layered crystal 

      Gasanly, N. M.; Aydnl, A.; Özkan, H.; Kocabaş, C. (Elsevier Science, 2002)
      The temperature dependencies (15-300 K) of seven Raman-active mode frequencies and linewidths in layered gallium selenide have been measured in the frequency range from 10 to 320 cm-1. We observed softening and broadening ...
    • A tool for pattern information extraction and defect quantification from crystal structures 

      Okuyan, E.; Okuyan, E. (Elsevier, 2015)
      In this paper, we present a revised version of BilKristal 2.0 tool. We added defect quantification functionality to assess crystalline defects. We improved visualization capabilities by adding transparency support and ...
    • Widely tunable resonant cavity enhanced detectors built around photonic crystals 

      Temelkuran, B.; Ozbay, E. (Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, United States, 1999)
      We report a resonant cavity enhanced (RCE) detector built around a three-dimensional photonic band gap crystal. We have demonstrated the resonant cavity enhanced (RCE) effect by placing microwave detectors in defect ...