Now showing items 1-9 of 9

    • Efficient computation of quadratic-phase integrals in optics 

      Özaktaş, H. M.; Koç, A.; Sarı, I.; Kutay, M. A. (Optical Society of America, 2006)
      Received June 29, 2005; revised manuscript received August 22, 2005; accepted September 12, 2005 We present a fast N log N time algorithm for computing quadratic-phase integrals. This three-parameter class of integrals ...
    • Electromagnetically induced left-handedness in a dense gas of three-level atoms 

      Oktel, M. Ö.; Müstecaphoǧlu, Ö. E. (The American Physical Society, 2004)
      Ways in which a three-level system can be used to change the frequency-dependent magnetic permeability of an atomic gas were discussed. The resulting macroscopic electrodynamics was also discussed. The two levels were ...
    • Fast and accurate algorithm for the computation of complex linear canonical transforms 

      Koç A.; Haldun M. Özaktaş; Hesselink, L. (Optical Society of America, 2010-08-05)
      A fast and accurate algorithm is developed for the numerical computation of the family of complex linear canonical transforms (CLCTs), which represent the input-output relationship of complex quadratic-phase systems. ...
    • Fast and accurate computation of two-dimensional non-separable quadratic-phase integrals 

      Koç A.; Haldun M. Özaktaş; Hesselink, L. (Optical Society of America, 2010-05-12)
      We report a fast and accurate algorithm for numerical computation of two-dimensional non-separable linear canonical transforms (2D-NS-LCTs). Also known as quadratic-phase integrals, this class of integral transforms ...
    • Lasing modes of infinite periodic chain of quantum wires 

      Byelobrov, V. O.; Benson, T. M.; Sewell, P.; Altıntaş, Ayhan; Nosich, A. I. (IEEE, 2009-06-07)
      In this paper, we study the scattering and eigenvalue problems for a periodic open optical resonator that is an infinite chain of active circular cylindrical quantum wires standing in free space. The scattering problem is ...
    • The method of analytical regularization in the electromagnetic wave scattering by thin disks 

      Balaban, M. V.; Nosich, A. I.; Altıntaş, Ayhan; Benson, T. M. (Institution of Engineering and Technology, 2007)
      We consider the problem of diffraction of an arbitrary electromagnetic wave by a thin disk made from different materials and located in free space. Here we imply a zero- thickness perfectly electrically conducting (PEC) ...
    • Microwave transmission through metamaterials in free space 

      Aydın, Koray; Bayındır, Mehmet; Özbay, Ekmel (2002)
      To investigate properties of metamaterials, composite structures which consists of periodical arrangement of thin copper wires and SRRs on a circuit board was constructed. Through this, the transmission properties of ...
    • Transmission properties of composite metamaterials in free space 

      Bayındır, Mehmet; Aydin, K.; Özbay, Ekmel; Markoš, P.; Soukoulis, C. M. (American Institute of Physics, 2002)
      We propose and demonstrate a type of composite metamaterial which is constructed by combining thin copper wires and split ring resonators (SRRs) on the same board. The transmission measurements performed in free space ...
    • Ultralow threshold laser action from toroidal polymer microcavity 

      Tulek, A.; Akbulut, D.; Bayındır, Mehmet (American Institute of Phycsics, 2009)
      We report laser action from a toroidal microcavity coated with π-conjugated polymer. An ultralow threshold value of ∼200 pJ/pulse is achieved by free space excitation in ambient conditions. This is the lowest threshold ...