Now showing items 1-13 of 13

    • Broadband one way propagation via dielectric waveguides with unequal effective index 

      Öner, B. B.; Üstün, K.; Kurt, H.; Okyay, Ali Kemal; Turhan-Sayan, G. (IEEE, 2014)
      We present an efficient approach for broad band one way propagation of light by parallel and unequal dielectric waveguides leading different effective phase shifts. Three dimensional numerical simulations show that 30% ...
    • Crossed chiral band approximation for wide-band self-collimation of light 

      Gümüş, M. A.; Akçaalan, Önder; Kurt, H. (Institute of Physics Publishing, 2020)
      We propose a perspective to the evaluation of the wide bandwidth phenomenon for low-symmetric photonic structures, by introducing the band tailoring and chiral band approximation on the self-collimation effect. In the ...
    • Dual-frequency division de-multiplexer based on cascaded photonic crystal waveguides 

      Akosman, Ahmet E.; Mutlu, Mehmet; Kurt, H.; Özbay, Ekmel (Elsevier, 2012-02-28)
      A dual-frequency division de-multiplexing mechanism is demonstrated using cascaded photonic crystal waveguides with unequal waveguide widths. The de-multiplexing mechanism is based on the frequency shift of the waveguide ...
    • Dynamic beam splitter employing an all-dielectric metasurface based on an elastic substrate 

      Koçer, Hasan; Durna, Y.; Kurt, H.; Özbay, Ekmel (OSA - The Optical Society, 2020)
      Beam splitters are an indispensable part of optical measurements and applications. We propose a dynamic beam splitter incorporating all-dielectric metasurface in an elastic substrate under external mechanical stimulus of ...
    • Enhanced superprism effect in symmetry reduced photonic crystals 

      Gumus, M.; Giden, I. H.; Akcaalan, O.; Turduev, M.; Kurt, H. (American Institute of Physics, 2018)
      We propose compact S-vector superprism providing broadband wavelength sensitivity within a/λ = 0.610-0.635, where "a" is the lattice constant, λ is the incident wavelength, and S denotes the Poynting vector. The reported ...
    • The focusing effect of graded index photonic crystals 

      Kurt, H.; Colak, E.; Cakmak, O.; Caglayan, H.; Özbay, Ekmel (AIP Publishing LLC, 2008)
      We describe an approach to implement graded index (GRIN) structures using two-dimensional photonic crystals (PCs). The lattice spacing along the transverse direction to propagation is altered and we show, both theoretically ...
    • High efficiency of graded index photonic crystal as an input coupler 

      Cakmak, A. O.; Colak, E.; Caglayan, H.; Kurt, H.; Özbay, Ekmel (AIP Publishing LLC, 2009)
      A graded index photonic crystal (GRIN PC) configuration was placed at the input side of a photonic crystal waveguide (PCW) in order to efficiently couple the light waves into the waveguide. We compared the transmission ...
    • Multiple slow waves and relevant transverse transmission and confinement in chirped photonic crystals 

      Serebryannikov, A. E.; Cakmak, A. O.; Colak, E.; Caglayan, H.; Kurt, H.; Özbay, Ekmel (OSA Publishing, 2014-09-02)
      The dispersion properties of rod-type chirped photonic crystals (PhCs) and non-channeled transmission in the direction of the variation of structural parameters from one cell of such a PhC to another are studied. Two types ...
    • Nanosphere concentrated photovoltaics with shape control 

      Esmaeilzad, N. S.; Demir, Ahmet Kemal; Hajivand, J.; Çiftpınar, H.; Turan, R.; Kurt, H.; Bek, A. (Wiley, 2020-12)
      Dielectric colloidal nanospheres (NSs) are promising candidates for light management in photonic devices such as solar cells (SCs). NS arrays can direct the broad incident solar radiation into a set of tighter foci, at ...
    • Submicron size all-semiconductor vertical cavities with high Q 

      Demir, Abdullah; Apaydın, D.; Kurt, H. (Institute of Electrical and Electronics Engineers Inc., 2019)
      The miniaturization of lasers promises on-chip optical communications and data processing speeds that are beyond the capability of electronics and today's high-speed lasers. Lasers with low-power consumption are one of the ...
    • Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides 

      Giden, I. H.; Yilmaz, D.; Turduev, M.; Kurt, H.; Colak, E.; Özbay, Ekmel (AIP Publishing, 2014)
      To provide asymmetric propagation of light, we propose a graded index photonic crystal (GRIN PC) based waveguide configuration that is formed by introducing line and point defects as well as intentional perturbations inside ...
    • Two-dimensional complex parity-time-symmetric photonic structures 

      Turduev, M.; Botey, M.; Giden, I.; Herrero, R.; Kurt, H.; Özbay, Ekmel; Staliunas, K. (American Physical Society, 2015-02)
      We propose a simple realistic two-dimensional complex parity-time-symmetric photonic structure that is described by a non-Hermitian potential but possesses real-valued eigenvalues. The concept is developed from basic ...
    • Unveiling the optical parameters of vanadium dioxide in the phase transition region: a hybrid modeling approach 

      Çakır, Mehmet Cihan; Koçer, Hasan; Durna, Y.; Yıldırım, Deniz Umut; Ghobadi, Amir; Hajian, Hodjat; Aydın, K.; Kurt, H.; Sağlam, N.; Özbay, Ekmel (Royal Society of Chemistry, 2020)
      The phase change behavior of vanadium dioxide (VO2) has been widely explored in a variety of optical and photonic applications. Commonly, its optical parameters have been studied in two extreme regimes: hot (metallic) and ...