Browsing by Keywords "Electromagnetic waves"
Now showing items 1-20 of 51
-
Analysis of an arbitrary profile reflector antenna having resistive-type surface-H-polarization case
(2008)A regularization-based numerical solution is obtained for arbitrary-shape conic section profile reflector antenna in 2-D, for the H-polarization case. New point is that the reflector surface is assumed a resistive-type ... -
Application of signal-processing techniques to reduce the errors related to the FDTD excitations
(2001)A study on the reduction of the errors related to the finite-difference time-domain (FDTD) excitations was performed by employing signal-processing techniques. Plane-wave scattering problems were simulated. The improvements ... -
Band-dropping via coupled photonic crystal waveguides
(Optical Society of American (OSA), 2002)We observe the dropping of electromagnetic waves having a specific frequency or a certain frequency band in two-dimensional dielectric photonic crystals. The single frequency is dropped via cavity-waveguide coupling. ... -
Beaming of electromagnetic waves emitted through a subwavelength annular aperture
(Optical Society of American (OSA), 2006)We study the diffraction of electromagnetic waves from subwavelength metallic circular apertures in the microwave spectrum. The theoretical and experimental demonstration of the near- and far-field electromagnetic distributions ... -
Bio-insprired optoelectronic digital nose for breath analysis
(2011)A novel electronic nose device is presented that can be used in disease diagnostics by exhaled breath analysis. Exhaled breath contains more than a thousand organic compounds that can be analysed to insect various diseases ... -
Broadband circular polarizer based on high-contrast gratings
(Optical Society of America, 2012-05-30)A circular polarizer, which is composed of periodic and two-dimensional dielectric high-contrast gratings, is designed theoretically such that a unity conversion efficiency is achieved at λ0 = 1.55 μm. The operation is ... -
Compound Hertzian chain model for copper-carbon nanocomposites' absorption spectrum
(2011)The infrared range optical absorption mechanism of carbon-copper composite thin layer coated on the diamond-like carbon buffer layer has been investigated. By consideration of weak interactions between copper nanoparticles ... -
Controlling phase of microwaves with active graphene surfaces
(American Institute of Physics Inc., 2017)In this letter, we report a method to control the reflection phase of microwaves using electrically tunable graphene devices. The device consists of mutually gated large-area graphene layers placed at a quarter-wave distance ... -
Coupled deconvolution for frequency extrapolation of electromagnetic solutions with matrix pencil method
(2005)Matrix pencil method (MPM) has been widely used to estimate the parameters of complex-exponential based models. An important application is the extrapolation of the frequency-domain solutions of electromagnetic problems. ... -
Coupled matrix pencil method for frequency extrapolation of electromagnetic solutions
(2005)Matrix pencil method (MPM) is used to extrapolate the available electromagnetic solutions in frequency domain to estimate the high-frequency solutions. A new approach, namely, coupled MPM, is introduced to obtain the ... -
Coupled-cavity structures in photonic crystals
(2002)We investigate the localized coupled-cavity modes in two-dimensional dielectric photonic crystals. The transmission, phase, and delay time characteristics of the various coupled-cavity structures are measured and calculated. ... -
Designing materials with desired electromagnetic properties
(Wiley, 2006)In this work, we suggest and demonstrate a robust method to tune the plasma frequencies of wire mediums. The method we suggest involves the use of two or more wire arrangements in the unit cell. By incorporating the method ... -
Effect of cross-sectional geometry on the RPA plasmons of quantum wires
(Pergamon Press, 1994)The effect of cross-sectional geometry on both the intrasubband plasmon and intersubband plasmon of a quantum wire is investigated within a two-subband RPA scheme. Exact analytical electronic wavefunctions for circular, ... -
Efficient use of closed-form Green's functions for three-dimensional problems involving multilayered media
(Institute of Electrical and Electronics Engineers, 1994)With the use of casting the spatial domain Green's functions into closed forms approach, it was demonstrated that the computational efficiency of the method of moments (MoM) for the solution of the mixed potential integral ... -
Electrically controlled terahertz spatial light modulators with graphene arrays
(Institute of Electrical and Electronics Engineers Inc., 2016)Gate-tunable high-mobility electrons on atomically thin graphene layers provide a unique opportunity to control electromagnetic waves in a very broad spectrum. In this paper, we describe an electrically-controlled multipixel ... -
Electromagnetic wave focusing from sources inside a two-dimensional left-handed material superlens
(Institute of Physics Publishing, 2006)Lenses made of negative index materials exhibit different focusing behaviours compared to positive index material lenses. Flat lens behaviour and imaging below the diffraction limit is possible with negative refractive ... -
Electronic transport through a kink in an electron waveguide
(Institute of Electrical and Electronics Engineers, 1994)The current-voltage denendence correspondinp to electronic transport through a kink in an electronic waveguide is analyzed. No phase breaking dissipation mechanisms are considered, but the effects of the Coulomb interaction ... -
Enhanced transmission of microwave radiation in one-dimensional metallic gratings with subwavelength aperture
(American Institute of Physics, 2004)We report a theoretical and experimental demonstration of enhanced microwave transmission through subwavelength apertures in metallic structures with double-sided gratings. Three different types of aluminum gratings ... -
EU NoE metamorphose: Metamaterials research activities
(2005)We will present the activities of METAMORPHOSE a network of excellence (NoE) formed under EU-FP6 on the area of metamaterials. The main scientific objective of the partners of this consortium is to develop new types of ... -
Experimental demonstration of highly confined photonic crystal based waveguides
(2001)The bending and guiding of the electromagnetic (EM) waves in highly confined waveguides was demonstrated. The electromagnetic waves were constructed by removing a single rod from a perfect three layer-by-layer photonic ...
