Now showing items 1-12 of 12

    • Chiral metamaterials with negative refractive index based on four "U" split ring resonators 

      Li, Z.; Zhao, R.; Koschny, T.; Kafesaki, M.; Alici, K. B.; Colak, E.; Caglayan, H.; Özbay, Ekmel; Soukoulis, C. M. (American Institute of Physics, 2010-08-23)
      A uniaxial chiral metamaterial is constructed by double-layered four "U" split ring resonators mutually twisted by 90°. It shows a giant optical activity and circular dichroism. The retrieval results reveal that a negative ...
    • Chiral metamaterials: From negative index to asymmetric transmission 

      Mutlu, Mehmet; Li, Zhaofeng; Özbay, Ekmel (IEEE, 2013)
      Chiral metamaterials are attractive for their intriguing properties such as negative refractive index, optical activity and circular dichroism, and asymmetric transmission. In this paper, we review the research we have ...
    • Complementary chiral metamaterials with giant optical activity and negative refractive index 

      Li, Z.; Alici, K. B.; Colak, E.; Özbay, Ekmel (American Institute of Physics, 2011-04-20)
      A complementary bilayer cross-wire chiral metamaterial is proposed and studied experimentally and numerically. It exhibits giant optical activity and a small circular dichroism. The retrieval results reveal that a negative ...
    • Conversion from constitutive parameters to dispersive transmission line parameters for multi-band metamaterials 

      Ozturk, Y.; Yilmaz, A. E.; Özbay, Ekmel (Taylor and Francis Ltd., 2016)
      In this study, we explain an approach including conversion from constitutive parameters to dispersive transmission line parameters using the double-band DNG (double-negative) properties of the circular type fishnet ...
    • Experimental study of subwavelength focusing by lefthanded metamaterials with a negative refractive index 

      Özbay, Ekmel; Aydin, K. (2007)
      Two dimensional (2D) left-handed metamaterials (LHM) exhibiting negative refraction and subwavelength imaging are studied experimentally. A left-handed transmission band is observed at the frequencies where both dielectric ...
    • The magical world of metamaterials 

      Özbay, Ekmel (IEEE, 2009-10)
      In recent years, there has been a burgeoning interest in rapidly growing field of metamaterials due to their unprecedented properties unattainable from ordinary materials. Veselago pointed out that a material exhibiting ...
    • The magical world of metamaterials 

      Çağlayan, Hümeyra; Özbay, Ekmel (SPIE, 2009)
      We review experimental and theoretical studies performed on left-handed metamaterials (LHM). The metamaterials exhibit quiet unusual electromagnetic properties such as negative refraction, negative phase velocity, subwavelength ...
    • Negative refraction and subwavelength focusing in two-dimensional photonic crystals 

      Özbay, Ekmel; Özkan, Gonca (Springer-Verlag, 2007)
      We experimentally and theoretically demonstrate negative refraction and focusing on electromagnetic (EM) waves by using two-dimensional photonic crystal slabs at microwave frequencies. Negative refraction is observed both ...
    • Negative refraction and subwavelength focusing using left-handed composite metamaterials 

      Özbay, Ekmel; Aydın, Koray (SPIE, 2008-01)
      We review experimental studies performed on left-handed metamaterials (LHM) at microwave frequencies. The metamaterial structure is composed of periodic arrays of split-ring resonators and wire meshes and exhibits a ...
    • A planar metamaterial with dual-band double-negative response at EHF 

      Gundogdu, T. F.; Guven, K.; Gokkavas, M.; Soukoulis, C. M.; Özbay, Ekmel (IEEE, 2009-10-02)
      We report the fabrication and electromagnetic characterization of a planar composite metamaterial (CMM) that is designed to achieve dual-frequency double-negative response at the lower end of the extremely high-frequency ...
    • Science meets magic: photonic metamaterials 

      Özbay, Ekmel (Society of Photo-Optical Instrumentation Engineers, 2012-05)
      The word "magic" is usually associated with movies, fiction, children stories, etc. but seldom with the natural sciences. Recent advances in metamaterials have changed this notion, in which we can now speak of "almost ...
    • Two-dimensional left-handed metamaterial with a negative refractive index 

      Aydın, Koray; Güven, Kaan; Özbay, Ekmel (IOP, 2006)
      We present a two-dimensional metamaterial with left-handed properties in a certain frequency range where both effective dielectric permittivity and magnetic permeability is simultaneously negative. A wedge-shaped metamaterial ...