Browsing by Author "Colak, E."
Now showing items 1-20 of 21
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Characterization, slab-pair modeling and phase analysis of circular fishnet metamaterials
(Elsevier, 2012-06-09)Planar metamaterials, which have incident to normal plane excitation unlike SRR-type structures and that are easily fabricated in multilayer form, have received great interest in recent years. In this paper, one-dimensional ... -
Chiral metamaterials with negative refractive index based on four "U" split ring resonators
(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 ... -
Complementary chiral metamaterials with giant optical activity and negative refractive index
(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 ... -
Coupling effect between two adjacent chiral structure layers
(Optical Society of America, 2010-03-01)A pair of mutually twisted metallic cross-wires can produce giant optical activity. When this single chiral layer is stacked layer by layer in order to build a thick chiral metamaterial, strong coupling effects are ... -
Diffraction inspired unidirectional and bidirectional beam splitting in defect-containing photonic structures without interface corrugations
(American Institute of Physics Inc., 2016)It is shown that strong diffractions and related dual-beam splitting can be obtained at transmission through the nonsymmetric structures that represent two slabs of photonic crystal (PhC) separated by a single coupled-cavity ... -
Dispersion irrelevant wideband asymmetric transmission in dielectric photonic crystal gratings
(Optical Society of America, 2012-11-22)Wideband suppression of zero order and relevant strongly asymmetric transmission can be obtained in photonic crystal gratings that are made of linear isotropic materials and show the broken structural (axial) symmetry, ... -
Enhanced transmission and directivity from metallic subwavelength apertures with nonuniform and nonperiodic grooves
(AIP Publishing LLC, 2008)Nonuniform and nonperiodic grooves are used to enhance the transmission and directivity of emissions from a single metallic subwavelength aperture. By using nonuniform and nonperiodic grooves, the amplitude and phase of ... -
Enhanced transmission through a subwavelength aperture using metamaterials
(AIP Publishing LLC, 2009-08-04)We report an enhanced transmission through a single circular subwavelength aperture that is incorporated with a split ring resonator (SRR) at the microwave regime. Transmission enhancement factors as high as 530 were ... -
Experimental study of broadband unidirectional splitting in photonic crystal gratings with broken structural symmetry
(American Institute of Physics, 2013-04-15)It is experimentally demonstrated that the combination of diode and splitter functions can be realized in one broadband reciprocal device. The suggested performance is based on the dielectric photonic crystal grating whose ... -
The focusing effect of graded index photonic crystals
(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 ... -
Frequency dependent steering with backward leaky waves via photonic crystal interface layer
(Optical Society of America, 2009)A Photonic Crystal (PC) with a surface defect layer (made of dimers) is studied in the microwave regime. The dispersion diagram is obtained with the Plane Wave Expansion Method. The dispersion diagram reveals that the ... -
High efficiency of graded index photonic crystal as an input coupler
(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 ... -
Multifrequency spatial filtering: a general property of two-dimensional photonic crystals
(Elsevier, 2016)Spatial filtering, an analog of frequency-domain filtering that can be obtained in the incidence angle domain at a fixed frequency is studied in the transmission mode for slabs of two-dimensional rod-type photonic crystals. ... -
Multiple slow waves and relevant transverse transmission and confinement in chirped photonic crystals
(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 ... -
Photonic Crystal based spatial filtering
(IEEE, 2009)Two dimensional Photonic Crystal structure is used to achieve spatial filtering. The structure provides bandstop filtering in the incident angle range of 18° to 38°. The transmission is close to unity outside of this range. ... -
Simultaneously opening transmission channels with negative and positive phase velocities for the stacked subwavelength apertures in fishnet metamaterials with hybrid unit lattices
(S P I E - International Society for Optical Engineering, 2012-10-05)Hybridization of the unit lattice along the propagation direction was demonstrated to produce a negative-phase-velocity transmission band in the absence of the contributions from the higher diffraction orders for a stacked ... -
Spatial filtering using dielectric photonic crystals at beam-type excitation
(American Institute of Physics, 2010-12-06)Spatial filtering is demonstrated at beam-type excitations by utilizing finite thickness slabs of two-dimensional dielectric photonic crystals (PCs) showing exotic Fabry-Perot resonances that are preserved over a wide range ... -
Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides
(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 ... -
Transmission enhancement through deep subwavelength apertures using connected split ring resonators
(Optical Society of American (OSA), 2010)We report astonishingly high transmission enhancement factors through a subwavelength aperture at microwave frequencies by placing connected split ring resonators in the vicinity of the aperture. We carried out numerical ... -
Two types of single-beam deflection and asymmetric transmission in photonic structures without interface corrugations
(Optical Society of America, 2016)We study single-beam deflection and asymmetry in transmission, two aspects of the same phenomenon that appear in the topologically simple, nonsymmetric, photonic crystal (PhC)-based structures without corrugations at the ...
