Browsing Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering by Submit Date
Now showing items 1-20 of 241
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Directly Copolymerized Disulfonated Poly (arylene ether sulfone) Membranes for Vanadium Redox Flow Batteries
(ESG, 2014-06)For the first time with this study, membranes from directly copolymerized disulfonated poly(arylene ether sulfone) (BPSH 35) were utilized to replace NafionTM in vanadium redox flow batteries (VRFB). Direct copolymerization ... -
Impedance Spectroscopy and Dielectric Properties of Silver Incorporated Indium Sulfide Thin Films
(2014-04-14)In this study, silver incorporated indium sulfide (In2S3) thin films have been deposited on soda lime glass via spray pyrolysis technique. Structural and electrical properties have been tailored by adding controlled amount ... -
Nanoporous Pt and Ru catalysts by chemical dealloying of Pt-Al and Ru-Al alloys for ultrafast hydrogen generation
(Elsevier Ltd., 2018-05-05)Novel nanoporous catalysts from selective dissolution of alloys have been prepared for fast hydrogen generation from chemical hydrides. Pt and Ru have been used as precious metals in the alloys, while the nonprecious metal ... -
Silica based inorganic-organic hybrid materials for the adsorptive removal of chromium
(Royal Society of Chemistry, 2018-07-02)We employed polymer functionalized silica gel as an adsorbent for the removal of Cr(vi) from water. The chains of 2-aminoethyl methacrylate hydrochloride (AEMA·HCl) polymer were grown from the surface of silica gel via ... -
Asymmetric light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure
(American Physical Society, 2018-12-10)In this paper, we present the numerical and experimental demonstration of asymmetric light transmission by a compact photonic crystal (PC) structure, which sustains semi-Dirac cone dispersion. The semi-Dirac point is ... -
Directional invisibility by genetic optimization
(Optical Society of America, 2018-12-01)In this Letter, the design of a directional optical cloaking by a genetic algorithm is proposed and realized experimentally. A three-dimensional finite-difference time-domain method is combined with the genetic optimization ... -
Integrated silicon photonic device design by attractor selection mechanism based on artificial neural networks: Optical coupler and asymmetric light transmitter.
(OSA - The Optical Society, 2018-10-29)Recently, different nanophotonic computational design methods based on optimization algorithms have been proposed which revolutionized the conventional design techniques of photonic integrated devices. The intelligently ... -
Tunable optical behavior of infrared filters with phase change material
(Society of Photo-Optical Instrumentation Engineers (SPIE), 2018-10-01)We propose an asymmetric to quasisymmetric behavioral tunability of a structured filter operating in the mid-infrared (IR) spectral region, where the atmospheric transparency is high. The structure is designed through ... -
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 ... -
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. ... -
Ultracompact Photonic Structure Design for Strong Light Confinement and Coupling Into Nanowaveguide
(Institute of Electrical and Electronics Engineers Inc., 2018-07-15)Different optimization algorithms have recently been utilized to design and improve the performance of many nanophotonic structures. We present the design of a compact photonic structure by an approach based on machine ... -
Invisibility on demand based on a generalized Hilbert transform
(American Physical Society, 2018-07-12)We propose a feasible invisibility approach to suppress the scattering of waves from or to given directions and for particular frequencies, i.e., invisibility on demand. We derive a generalized Hilbert transform for a ... -
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 ... -
Broadband self-collimation in C2 symmetric photonic crystals
(OSA - The Optical Society, 2018-06-01)In this study, we report a low-symmetric photonic crystal (PhC) structure that exhibits high coupling efficiency in a broadband frequency range with a tilted self-collimating capability. First, the analytical approach is ... -
Full utilization of semi-Dirac cones in photonics
(American Physical Society, 2018-05-16)In this study, realization and applications of anisotropic zero-refractive-index materials are proposed by exposing the unit cells of photonic crystals that exhibit Dirac-like cone dispersion to rotational symmetry reduction. ... -
All-Dielectric Self-Cloaked Structures
(American Chemical Society, 2018-05-16)A general procedure to design objects that are intrinsically invisible (without the necessity of an external cloak) has not been demonstrated so far. Here we propose a flexible method to design such self-cloaked objects ... -
Directionality fields generated by a local Hilbert transform
(American Physical Society, 2018-03-15)We propose an approach based on a local Hilbert transform to design non-Hermitian potentials generating arbitrary vector fields of directionality, p→(r→), with desired shapes and topologies. We derive a local Hilbert ... -
Broadband direction-dependent transmission of light with photonic crystal heterostructure grating
(IOP Publishing Ltd., 2018-01-17)Direction-dependent light transmission is a remarkable phenomenon owing to its great potential to be used in optical communication processing systems such as optical diodes, isolators and rectifiers. All these applications ... -
Route from discreteness to the continuum for the Tsallis q-entropy
(American Physical Society, 2018-01-05)The existence and exact form of the continuum expression of the discrete nonlogarithmic q-entropy is an important open problem in generalized thermostatistics, since its possible lack implies that nonlogarithmic qentropy ...
