The Experts below are selected from a list of 30789 Experts worldwide ranked by ideXlab platform
H. Lim - One of the best experts on this subject based on the ideXlab platform.
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Roles of Wave Impedance and refractive index in photonic crystals with magnetic and dielectric properties
IEEE Transactions on Microwave Theory and Techniques, 1999Co-Authors: Chul-sik Kee, Jae-eun Kim, Hae Yong Park, H. LimAbstract:We investigated the roles of Wave Impedance and refractive index in photonic crystals by means of analytical expressions for edges frequencies of a photonic bandgap (PBG) in a one-dimensional photonic crystal with magnetic and dielectric properties. The analytical expressions were derived when the optical thicknesses of layers are the same. The Wave Impedance governs the formation of PBG's and the intensity of defect modes. Meanwhile, the position of PBG's and the creation of defect modes are related to the refractive index.
Chul-sik Kee - One of the best experts on this subject based on the ideXlab platform.
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Roles of Wave Impedance and refractive index in photonic crystals with magnetic and dielectric properties
IEEE Transactions on Microwave Theory and Techniques, 1999Co-Authors: Chul-sik Kee, Jae-eun Kim, Hae Yong Park, H. LimAbstract:We investigated the roles of Wave Impedance and refractive index in photonic crystals by means of analytical expressions for edges frequencies of a photonic bandgap (PBG) in a one-dimensional photonic crystal with magnetic and dielectric properties. The analytical expressions were derived when the optical thicknesses of layers are the same. The Wave Impedance governs the formation of PBG's and the intensity of defect modes. Meanwhile, the position of PBG's and the creation of defect modes are related to the refractive index.
Karl Unterrainer - One of the best experts on this subject based on the ideXlab platform.
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Metallic Wave-Impedance matching layers for broadband terahertz optical systems.
Optics express, 2007Co-Authors: J. Kroll, Juraj Darmo, Karl UnterrainerAbstract:We examine the potential of ultra-thin metallic layers for broadband Wave-Impedance matching in the terahertz frequency range. The metallic layer is modeled using Fresnel formulae for stratified optical medium. Experimental data for chromium and indium-tin-oxide layers, measured using time-domain terahertz spectroscopy over the frequency range 0.4 - 4.5 THz, are compared with theoretical results.
O. I. Hryhorchak - One of the best experts on this subject based on the ideXlab platform.
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Application of a quantum Wave Impedance approach for a quantum capacitance calculation
arXiv: Quantum Physics, 2020Co-Authors: O. I. HryhorchakAbstract:A method for a calculation of quantum capacitance for a two-dimesional electron gas (2DEG) in potential wells of complicated geometry on the base of a quantum Wave Impedance technique was proposed. The application of this method was illustated on four different forms of potential wells: infinite and finit rectangular well, a finit rectangular double well and a parabolic double well. It was shown how a quantum capacitance of these wells depends on its parametres. Numerical calculations of a quantum capacitance for mentioned potential wells were made at temperature $T=0$ and the results were presented graphically.
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An application of a quantum Wave Impedance method to finite periodic structures
arXiv: Quantum Physics, 2020Co-Authors: O. I. HryhorchakAbstract:The relations between a quantum Wave Impedance function and elements of transfer and scattering matrixes for quantum mechanical systems with arbitrary localized form of potential were established. Obtained results allows using the advantages of both methods, namely a transfer matrix technique and a quantum Wave Impedance approach, for an investigating of nanosystems with a complicated geometry of a potential. A finit Dirac comb was solved and expressions for Tamm's levels in this system were derived within both approaches.
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Analytical representation of an iterative formula for a quantum Wave Impedance determination in a case of a piecewise constant potential.
arXiv: Quantum Physics, 2020Co-Authors: O. I. HryhorchakAbstract:An analytical solution for a quantum Wave Impedance in a case of piesewise constant potential was derived. It is in fact an analytical depiction of a well-known iterative method of a quantum Wave Impedance determination. The expression for a transmission probability as a function of a particle energy for an arbitrary cascad of constant potentials was obtained. The application of obtained results was illustrated on a system of double-well/barrier structures.
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Numerical study of quantum mechanical systems using a quantum Wave Impedance approach
arXiv: Quantum Physics, 2020Co-Authors: O. I. HryhorchakAbstract:The approximate numerical method for a calculation of a quantum Wave Impedance in a case of a potential energy with a complicated spatial structure is considered. It was proved that the approximation of a real potential by a piesewise constant function is also reasonable in a case of using a quantum Impedance approach.The dependence of an accuracy of numerical calculations on a number of cascads by which a real potential is represented was found. The method of including into a consideration of zero-range singular potentials was developed.
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Application of a quantum Wave Impedance method for study of infinite and semi-infinite periodic media
arXiv: Quantum Physics, 2020Co-Authors: O. I. HryhorchakAbstract:This paper is dedicated to an application of a quantum Wave Impedance approach for a study of infinite and semi-infinite periodic systems. Both a Dirac comb and a $\delta-\delta'$ comb as well as a Kronig-Penney model are considered. It was shown how to reformulate the problem of an investigation of mentioned systems in terms of a quantum Wave Impedance and it was demonstrated how much a quantum Wave Impedance approach simplifies studying these systems compared to other methods. The illustation of such a simplification was provided by application of classical approach, transfer matrix technique and a quatum Wave Impedance method for solving Kronig-Penney model.
Jae-eun Kim - One of the best experts on this subject based on the ideXlab platform.
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Roles of Wave Impedance and refractive index in photonic crystals with magnetic and dielectric properties
IEEE Transactions on Microwave Theory and Techniques, 1999Co-Authors: Chul-sik Kee, Jae-eun Kim, Hae Yong Park, H. LimAbstract:We investigated the roles of Wave Impedance and refractive index in photonic crystals by means of analytical expressions for edges frequencies of a photonic bandgap (PBG) in a one-dimensional photonic crystal with magnetic and dielectric properties. The analytical expressions were derived when the optical thicknesses of layers are the same. The Wave Impedance governs the formation of PBG's and the intensity of defect modes. Meanwhile, the position of PBG's and the creation of defect modes are related to the refractive index.
