Now showing items 1-19 of 19

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

      Öner, B.B.; Üstün, K.; Kurt, H.; Okyay, A.K.; Turhan-Sayan, G. (Institute of Electrical and Electronics Engineers Inc., 2014-12)
      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% ...
    • Compact rainbow trapping and demultiplexing by photonic crystal waveguides 

      Giden, I.H.; Kurt, Hamza; Turduev, M.; Staliunas, K. (Institute of Electrical and Electronics Engineers Inc., 2014)
      Graded Index Photonic Crystals (GRIN PhCs) are artificial periodic materials that possess gradually varying effective refractive indices. GRIN profiles can be formed by adjusting the radii or the locations of PhC unit ...
    • Design of flat lens-like graded index medium by photonic crystals: Exploring both low and high frequency regimes 

      Turduev, M.;  Giden, I.H.;  Kurt, Hamza (Elsevier, 2015-03)
      In this manuscript, we propose the design of an inhomogeneous artificially created graded index (GRIN) medium to enrich the optical device functionalities of light by using periodic all-dielectric materials. Continuous ...
    • Enhanced sub-wavelength focusing by tilted and modified graded index medium 

      Gayur, E.M.; Öner, B.B.; Kurt, Hamza (Institute of Electrical and Electronics Engineers Inc., 2014)
      The inhomogeneous variation of index distribution as graded index (GRIN) medium focuses light without the curved surfaces. In the current study, we investigate enhanced focusing properties of GRIN medium with tilted front ...
    • Inverse design of integrated photonic structures 

      Yılmaz, Yusuf Abdulaziz; Alpkılıç, Ahmet Mesut; Tutgun, Mediha; Yılmaz, Döne; Atalay, İpek Anıl; Yeltik, Aydan; Kurt, Hamza (IEEE Computer Society, 2019)
      Designs of photonic devices have been mainly based on intuitive and brute-force approach. However, there has been increasing demand in photonics to obtain high device performance and improved functionalities along with ...
    • Large bandwidth mode order converter by differential waveguides 

      Oner, B.B.;  Üstün, K.;  Kurt, Hamza;  Okyay, A.K.;  Turhan-Sayan, G. (Optical Society Of American (OSA), 2015-2)
      In this article, we propose a large bandwidth mode-order converter design by dielectric waveguides with equal lengths but different cross-sectional areas. The efficient conversion between even and odd modes is verified by ...
    • Manipulation of photonic nanojet using liquid crystals for elliptical and circular core-shell variations 

      Eti, N.;  Giden, I.H.;  Hayran, Z.;  Rezaei, B.;  Kurt, Hamza (Taylor And Francis Ltd., 2017-08)
      We present theoretical studies on a tunable photonic nanojet (PNJ) created by adapting a shell and liquid crystal (LC) core architecture. The shell is made of indium tin oxide and the core is infiltrated with nematic LCs. ...
    • Method of implementing graded index media by symmetry-reduced helical photonic structures 

      Giden, I.H.;  Rezaei, B.;  Kurt, Hamza (OSA - The Optical Society, 2015)
      We propose a new approach for the realization of a graded index (GRIN) medium using a symmetry reduced unit element in photonic crystals. An index gradient on the order of ?n = 0.16 is achieved without modifying the filling ...
    • Non-diffraction bloch modes in low-symmetric photonic crystals 

      Gumus, M.; Giden, I.H.; |Turduev, M.; Kurt, Hamza (OSA - The Optical Society, 2017)
      [No abstract available]
    • On-and off-optical-resonance dynamics of dielectric microcylinders under plane wave illumination 

      Mahariq, I.;  Kurt, Hamza (OSA - The Optical Society, 2015-06)
      We explore the on-resonance and off-resonance optical response of dielectric cylinders excited by normal incident plane waves. Both the analytical method, based on Mie theory, and the numerical method, implemented with the ...
    • Partial cloaking by graded index photonic crystals 

      Oner, B.B.; Can, M.G.; Kurt, Hamza (SPIE, 2014-04)
      Since the first proposal of the idea of optical cloaking, huge research effort has been spent to implement hiding objects. We propose a broad band all-dielectric partial (unidirectional) cloaking device that hides arbitrary ...
    • Photonic crystal based polarization insensitive flat lens 

      Turduev, M.;  Bor, E.;  Kurt, Hamza (Institute Of Physics Publishing, 2017-06)
      The paper proposes a new design of an inhomogeneous artificially created photonic crystal lens structure consisting of annular dielectric rods to efficiently focus both transverse electric and transverse magnetic polarizations ...
    • Photonic Crystal Spatial Filters fabricated by Physical Vapour Deposition 

      Gailevi?ius, D.; Grinevi?iüte, L.; Babayigit, C.; Bor, E.; Turduev, M.; Purlys, V.; Tolenis, T.; Kurt, Hamza; Staliunas, K (Institute of Electrical and Electronics Engineers Inc., 2019-06)
      The idea of the angular, or equivalently - spatial, filtering by photonic crystals (PhCs) is based on a selective diffraction of the light propagating through the double-periodic photonic structure. The angular components ...
    • Photonic Nanojet Analysis by Spectral Element Method 

      Mahariq, I.;  Kuzuoğlu, M.;  Tarman, I.H.;  Kurt, Hamza (Institute Of Electrical And Electronics Engineers Inc., 2014-09)
      Although it is known that the spectral element method (SEM) has both high accuracy and a lower computational cost when compared with finite-element or finite-difference methods, the SEM is not widely utilized in the modeling ...
    • Photonic wavy structures for angular filtering of light 

      Babayiğit, Ceren; Grineviciute , Lina; Gailevicius, Darius; Bor, Emre; Turduev, Mirbek; Purlys, Vytautas; Tolenis, Tomas; Kurt, Hamza; Staliunas, Kestutis (IEEE Computer Society, 2019)
      In this study, we propose and experimentally demonstrate spatial filtering of light by the photonic wavy structures designed to be operated in a Bragg regime. The proposed configuration is designed, optimized and analyzed ...
    • Polarization splitting phenomenon of photonic crystals constructed by two-fold rotationally symmetric unit-cells 

      Yasa, U.G.;  Giden, I.H.;  Turduev, M.;  Kurt, Hamza (Institute Of Physics Publishing, 2017-08)
      We present an intrinsic polarization splitting characteristic of low-symmetric photonic crystals (PCs) formed by unit-cells with C 2rotational symmetry. This behavior emerges from the polarization sensitive self-collimation ...
    • Reduced symmetry and analogy to chirality in periodic dielectric media 

      Giden, I.H.;  Turduev, M.;  Kurt, Hamza (Springer, 2014-09)
      Much attention has been paid to photonic applications based on periodic media. Meanwhile, quasi-periodic and disordered mediahave extended the research domain and provided additional novelties for manipulating and controlling ...
    • Theoretical and experimental investigations of efficient light coupling with spatially varied all dielectric striped waveguides 

      Yilmaz, Y.A.;  Tandogan, S.E.;  Hayran, Z.; Giden, I.H.;  Turduev, M.;  Kurt, Hamza (American Institute Of Physics Inc., 2017-07)
      Integrated photonic systems require efficient, compact, and broadband solutions for strong light coupling into and out of optical waveguides. The present work investigates an efficient optical power transferring the problem ...
    • Tuning light focusing with liquid crystal infiltrated graded index photonic crystals 

      Rezaei, B.;  Giden, I.H.;  Kurt, Hamza (Elsevier B.V., 2017-01)
      We perform numerical analyses of tunable graded index photonic crystals based on liquid crystals. Light manipulation with such a photonic medium is explored and a new approach for active tuning of the focal distance is ...