Now showing items 1-12 of 12

    • Anharmonicity in GaTe layered crystals 

      Aydinli, A.; 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 ...
    • Chalcogenide microresonators tailored to distinct morphologies by the shaping of glasses on silica tapers 

      Aktaş, O. (OSA - The Optical Society, 2017)
      Production of chalcogenide (As2Se3) microresonators in sphere, loop, and bottle morphologies by the shaping of glasses at appropriate temperatures between cleaved silica tapers is reported. The quality factors exceed QS = ...
    • Defect luminescence in some layered binary chalcogenide semiconductors 

      Aydinli, A.; Gasanly, N. M. (Scientific.Net, 2002)
      A number of semiconductors such as GaS, GaSe, GaSSe show layered structure where intralayer bonding is strong and interlayer bonding quite weak. With bandgaps mostly in the visible and the near infrared and high crystal ...
    • First Principles Study of Barium Chalcogenides 

      Gökoǧlu, G. (2008)
      In this study, ab initio calculation results of the vibrational properties and elastic parameters as well as characteristic Debye temperature and Poisson's ratios of two barium chalcogenides, BaSe and BaS, which crystallize ...
    • Hollow core photonic bandgap fibers for medical applications 

      Vural, Mert (Bilkent University, 2009)
      The design, fabrication and characterization of photonic band gap (PBG) based optical polymer fibers is discussed. Unlike conventional total internal reflection (TIR) fibers, used primarily in telecommunications, PBG ...
    • Homogeneity range of ternary 11-type chalcogenides Fe1 + yTe1−xSex 

      Koz, C.; Rößler, S.; Wirth, S.; Schwarz, U. (Springer, 2017)
      The 11-type Fe-chalcogenides belong to the family of Fe-based superconductors. In these compounds, the interstitial Fe is known to strongly influence the magnetic and superconducting properties. Here, we present the chemical ...
    • Liquid-phase synthesis of nanoparticles and nanostructured materials 

      Karatutlu, A.; Barhoum, A.; Sapelkin, A. (Elsevier, 2018)
      Nanoparticles less than 100nm in size have attracted significant interest over the past 20 years due to their unique properties led by quantum size effect. This chapter evaluates the synthesis methods in liquid phase ...
    • Low-temperature photoluminescence study of GaS0.5Se0.5 layered crystals 

      Aydnl, A.; Gasanly, N. M.; Gökşen, K. (Elsevier Science, 2001)
      Photoluminescence (PL) spectra of GaS0.5Se0.5 layered single crystals have been studied in the wavelength range of 565-860 nm and in the temperature range of 15-170 K. Two PL bands centered at 585 nm (2.120 eV) and 640 nm ...
    • A motion-and sound-activated, 3D-printed chalcogenide-based triboelectric nanogenerator 

      Kanik, M.; Say, M. G.; Daglar, B.; Yavuz, A. F.; Dolas, M. H.; El-Ashry, M. M.; Bayindir, M. (Wiley-VCH Verlag, 2015)
      A multilayered triboelectric nanogenerator (MULTENG) that can be actuated by acoustic waves, vibration of a moving car, and tapping motion is built using a 3D-printing technique. The MULTENG can generate an open-circuit ...
    • Tapered nanoscale chalcogenide fibers directly drawn from bulk glasses as optical couplers for high-index resonators 

      Aktaş, O.; Bayindir, M. (OSA - The Optical Society, 2017)
      We report production of air-clad tapered chalcogenide fibers by directly drawing bulk glasses between cleaved tips of tapered silica fibers. Exploiting these tapered fibers with nanoscale waists as evanescent optical ...
    • Thermally stimulated currents in n-InS single crystals 

      Gasanly, N. M.; Aydinli, A.; Yuksek, N. S. (Elsevier Science, 2003)
      Thermally stimulated current measurements are carried out on as-grown n-InS single crystals in the temperature range of 10-125 K. Experimental evidence is found for four trapping centers present in InS. They are located ...
    • Tunable ring-coupled Mach-Zehnder interferometer based on lithium niobate 

      Solmaz, M. E. (Taylor and Francis, 2014)
      The fabrication and characterization are reported of a Fano resonance-based electro-optically tunable ring resonator-coupled Mach-Zehnder interferometer device based on a chalcogenide-lithium niobate hybrid waveguide system. ...