The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Ivan V. Andronov - One of the best experts on this subject based on the ideXlab platform.
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Diffraction of a high-frequency electromagnetic Wave Incident at a small angle to the axis of a strongly elongated body
Journal of Communications Technology and Electronics, 2020Co-Authors: Ivan V. AndronovAbstract:Diffraction of a plane electromagnetic Wave Incident at a small angle to the axis of a strongly elongated perfectly conducting body of revolution is investigated. The highest term of the asymptotic of the induced surface current is expressed through a new special function of three arguments obtained in the study. It is shown that, in the case of the axial incidence, this function is reduced to the function introduced before. The influence of the parameter describing the elongation rate of the body and the influence of the incidence angle and Incident Wave polarization on the character of the current distribution over the surface are analyzed.
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High-frequency diffraction by a narrow hyperboloid of revolution
Acoustical Physics, 2017Co-Authors: Ivan V. AndronovAbstract:High-frequency diffraction of a plane acoustic Wave Incident at a small angle to the axis of a narrow hyperboloid of revolution is considered. By the parabolic equation method in spheroidal coordinates, the leading term of field asymptotics in the near-surface boundary layer is constructed in the form of an integral involving Whittaker functions. Difficulties associated with its calculation are considered. Results obtained for the field at the surface of a perfectly rigid hyperboloid are presented. They reproduce the predicted high-frequency diffraction effects.
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High-frequency scattering by a strongly elongated body
Acoustical Physics, 2013Co-Authors: Ivan V. AndronovAbstract:The problem of scattering of a high-frequency plane Wave Incident at a small angle to the axis of a strongly elongated spheroid is studied. The asymptotic formula for the scattering cross section is obtained in the case of ideal boundary conditions. The influence of the elongation rate of the spheroid and the angle of incidence of the plane Wave is analyzed based on computations.
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the currents induced by a high frequency Wave Incident at a small angle to the axis of strongly elongated spheroid
Progress in Electromagnetics Research M, 2013Co-Authors: Ivan V. AndronovAbstract:Previously derived asymptotics for difiraction by strongly elongated body is generalized to the case of nonaxial incidence. By applying \parabolic" equation method the asymptotics of the fleld in the boundary layer near the surface is constructed. This asymptotics takes into account the rate of elongation of the body and is applicable both to not too much elongated objects, where it reduces to Fock formulae, and to very elongated bodies.
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Diffraction of a plane Wave Incident at a small angle to the axis of a strongly elongated spheroid
Acoustical Physics, 2012Co-Authors: Ivan V. AndronovAbstract:The high-frequency acoustic field in the half-shadow region on the surface of a strongly elongated body of rotation is studied. The asymptotic formulas obtained earlier for axial incidence of a plane Wave are generalized to the case of incidence of a Wave at a small angle to the body axis. The results of calculations are presented. Analysis has been performed on how the angle of incidence and the parameter describing the degree of elongation of the body affect the character of the field distribution over the surface.
Lingyan Chen - One of the best experts on this subject based on the ideXlab platform.
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Guided-mode resonance Brewster filters with multiple channels
Applied Physics Letters, 2006Co-Authors: Zhanshan Wang, Tian Sang, Jingtao Zhu, Yonggang Wu, Li Wang, Lingyan ChenAbstract:In this letter, a type of guided-mode resonance (GMR) reflection filter incorporating multimode resonance and the Brewster effect is presented. Long-range, low sidebands, and multiple channels are found to be obtainable for a single-layer GMR reflection filter with a TM-polarized plane Wave Incident at the Brewster angle. Detailed characteristics are calculated using rigorous coupled-Wave analysis. In our calculation, for TM-polarized Incident Wave, we find it sufficiently accurate to calculate the effect index by using the zero-order permittivity ε0,TMof the effective media theory, and narrowband multichannel reflectance can be achieved at the Brewster angle by tuning the grating depth. © 2006 American Institute of Physics.
Zhanshan Wang - One of the best experts on this subject based on the ideXlab platform.
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Guided-mode resonance Brewster filters with multiple channels
Applied Physics Letters, 2006Co-Authors: Zhanshan Wang, Tian Sang, Jingtao Zhu, Yonggang Wu, Li Wang, Lingyan ChenAbstract:In this letter, a type of guided-mode resonance (GMR) reflection filter incorporating multimode resonance and the Brewster effect is presented. Long-range, low sidebands, and multiple channels are found to be obtainable for a single-layer GMR reflection filter with a TM-polarized plane Wave Incident at the Brewster angle. Detailed characteristics are calculated using rigorous coupled-Wave analysis. In our calculation, for TM-polarized Incident Wave, we find it sufficiently accurate to calculate the effect index by using the zero-order permittivity ε0,TMof the effective media theory, and narrowband multichannel reflectance can be achieved at the Brewster angle by tuning the grating depth. © 2006 American Institute of Physics.
M. Zavvari - One of the best experts on this subject based on the ideXlab platform.
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Second-Harmonic Generation in III-Nitride Quantum Wells Enhanced by Metamaterials
IEEE Photonics Technology Letters, 2016Co-Authors: Neda Nouri, M. ZavvariAbstract:© 1989-2012 IEEE.We report the results of theoretical investigation showing considerable enhancement of second harmonic generation (SHG) in multiple, asymmetric step GaN/AlGaN quantum wells (QWs) coupled to arrays of split ring resonators at mid-infrared frequencies. Simulations with a finite-difference time-domain (FDTD) method predict the highest SHG conversion factor about 11.2 W/ \text{W}^{2} with a dramatically low pump intensity of \sim 5 W/cm2 under normal incidence at 29 THz.Our results show that about three orders of magnitude in source power can be obtained by using III-nitride QWs instead of similar GaAs-based structures. The results imply that the combination of III-N QWs and metamaterials can be used for ultra-efficient SHG applications without any constraint in pump Wave Incident angle.
N.c. Gallagher - One of the best experts on this subject based on the ideXlab platform.
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Comments on "Electromagnetic Wave scattering by an infinite plane metallic grating in case of oblique incidence and arbitrary polarization
IEEE Transactions on Antennas and Propagation, 1990Co-Authors: S Sohail H Naqvi, N.c. GallagherAbstract:In a previous paper by K. Uchida et al. (see ibid., vol.36, no.3, p.415-22, 1988) it is claimed that in the case of an arbitrary polarized plane Wave Incident on a strip grating, it is necessary to investigate the quasi-two-dimensional problem where the separation into transverse magnetic (TM) and transverse electric (TE) Waves is, in general, impossible. It is shown here that although in general, arbitrarily polarized Incident Wave case decomposition into TE and TM Waves is impossible, it is possible to divide any electromagnetic field into two orthogonal components; (1) fast polarization where an H-field component parallel to the strips is zero and (2) slow polarization where an E-field component parallel to the strips is zero.
