Search
Now showing items 1-10 of 37
Photonic crystals based on aperiodic dielectric multilayers for optical filtering
(Institute of Physics Publishing, 2019-04)
In this study, we demonstrate two different methods to generate one-dimensional photonic crystals (PCs) based on aperiodic dielectric gratings and investigate their optical filtering characteristics. The first grating ...
Düşük dereceli dönel simetriye sahip iki-boyutlu fotonik kristal yapılarının sağladığı optik fenomenler ve nanofotonik alanındaki uygulamaları
(TOBB ETÜ Fen Bilimleri EnstitüsüTOBB University of Economics and Technology,Graduate School of Engineering and Science, 2018)
Literatürde çalışılan iki-boyutlu fotonik kristal yapılarının çoğunluğu, dairesel dielektrik çubuk veya dairesel hava deliklerinden oluşan yüksek dönel simetrik birim hücrelerden meydana gelmektedir. İki-boyutlu fotonik ...
Broadband and polarization-independent asymmetric transmission of visible light through a three-dimensional trapezoidal metallic metasurface
(OSA - The Optical Society, 2018-09-01)
In modern optical applications, it has become an important need to flow light unidirectionally. An optical diode realizes this task as an electrical counterpart manipulates the flow of electrons in semiconductor materials. ...
Highly controlled Bloch wave propagation in surfaces with broken symmetry
(OSA - The Optical Society, 2018-06-01)
We propose and demonstrate reduced symmetry photonic surfaces providing highly controlled Bloch wave propagation. The backward and dual directional propagations have been observed in the proposed low-symmetric periodic ...
Enhanced superprism effect in symmetry reduced photonic crystals
(American Institute of Physics Inc., 2018-09-24)
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 ...
Polarization-insensitive beam splitters using all-dielectric phase gradient metasurfaces at visible wavelengths
(OSA - The Optical Society, 2018-09-15)
Beam splitters play important roles in several optical applications, such as interferometers, spectroscopy, and optical communications. In this study, we propose and numerically examine polarization-insensitive beam splitters ...
Active beam steering and afocal zooming by nematic liquid crystal-infiltrated graded index photonic structures
(Institute of Physics Publishing, 2019)
This study presents active beam steering and afocal zooming of light by incorporating liquid crystals (LCs) with graded index photonic crystals (GRIN PCs). The GRIN PC structures are composed of low refractive index polymer ...
Fotonik yapıların eniyileme algoritması ile tasarımı
(TOBB ETÜ Fen Bilimleri EnstitüsüTOBB University of Economics and Technology,Graduate School of Engineering and Science, 2016)
Doğada bulunan malzemelerin farklı karakteristik özellikleri bulunmaktadır. Bu özelliklerden biri de maddenin ışık ile etkileşimine sebep olan kırıcılık indisidir. Farklı kırıcılık indislerine sahip dielektrik malzemelerin ...
Theoretical and experimental study on surface modes of low symmetric periodic structures
(IEEE Computer Society, 2017-09)
In this study, surface waves supported at the boundary of two-dimensional all dielectric low-symmetric periodic structures (LSPS) are numerically investigated and experimentally verified in the microwave region. In LSPSs ...
Metaheuristic approach enabled mode order conversion in photonic crystals: numerical design and experimental realization
(Institute of Physics Publishing, 2019)
In the presented study, we proposed a design approach based on optimization algorithm to obtain mode order conversion in photonic crystal (PC) structures and experimentally verify the numerical result of the corresponding ...
