Electromagnetic scattering from a coated notched cylinder

1989 ◽  
Vol 67 (6) ◽  
pp. 587-591
Author(s):  
R. Ruppin ◽  
H. Yatom
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Physical Parameters ◽  
Incident Plane Wave ◽  
Backscattering Cross Section ◽  
Incident Plane ◽  
Scattering Spectra ◽  
Electromagnetic Resonances

The problem of electromagnetic scattering of a normally incident plane wave from a coated conducting notched cylinder is solved. The coating material and the notch material are arbitrary dielectrics, and the incident wave is either transverse electric or transverse magnetic polarized. The numerical results of backscattering cross-section calculations are presented, and the dependence of the cross section on the various physical parameters is investigated. The coated notched cylinder system possesses characteristic electromagnetic resonances that manifest themselves in the scattering spectra.

scholarly journals Dual polarized engineering the extinction cross-section of a dielectric wire using graphene-based oligomers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shiva Hayati Raad ◽  
Zahra Atlasbaf
Keyword(s):  
Cross Section ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Infinite Length ◽  
Dielectric Cylinder ◽  
Fano Resonances ◽  
Spherical Nanoparticles ◽  
Extinction Cross Section ◽  
One Dimensional ◽  
Incident Plane

AbstractIn this paper, graphene-coated spherical nanoparticles are arranged around an infinite length dielectric cylinder to enhance its extinction cross-section. Initially, a single longitudinal one-dimensional periodic array is considered in different loci concerning the transverse electric (TE) incident plane wave. It is observed that regardless of the position of the particles, the extinction cross-section of the dielectric cylinder is considerably enhanced with respect to the bare one. Later, by increasing the number of longitudinal plasmonic arrays around the cylinder, each residing in a different azimuthal direction, the extinction cross-section is further manipulated to observe double pronounced Fano resonances. The origin of the Fano resonances is described by considering their planar counterparts constructed by the periodic assembly of plasmonic oligomers. Finally, the hexamer configuration is considered as the prototype, and the effect of various optical, geometrical, and material parameters on the optical response is investigated in detail. Interestingly, due to the spherical symmetry of the cells, the extinction cross-section is also enhanced for the transverse magnetic (TM) incident wave, which is unattainable using a continuous plasmonic cover made of metal or graphene. The potential application of our proposed structure is in the design of reconfigurable conformal optical absorbers and sensors.

Magnetic plasmons induced in a dielectric-metal heterostructure by optical magnetism

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shulei Li ◽  
Lidan Zhou ◽  
Mingcheng Panmai ◽  
Jin Xiang ◽  
Sheng Lan
Keyword(s):  
Transverse Electric ◽  
Incidence Angle ◽  
High Sensitivity ◽  
Critical Value ◽  
Transverse Magnetic ◽  
Quality Factors ◽  
Light Spectrum ◽  
Optical Resonances ◽  
Scattering Spectra ◽  
Plasmon Polaritons

Abstract We investigate numerically and experimentally the optical properties of the transverse electric (TE) waves supported by a dielectric-metal heterostructure. They are considered as the counterparts of the surface plasmon polaritons (i.e., the transverse magnetic (TM) waves) which have been extensively studied in the last several decades. We show that TE waves with resonant wavelengths in the visible light spectrum can be excited in a dielectric-metal heterostructure when the optical thickness of the dielectric layer exceeds a critical value. We reveal that the electric and magnetic field distributions for the TE waves are spatially separated, leading to higher quality factors or narrow linewidths as compared with the TM waves. We calculate the thickness, refractive index and incidence angle dispersion relations for the TE waves supported by a dielectric-metal heterostructure. In experiments, we observe optical resonances with linewidths as narrow as ∼10 nm in the reflection or scattering spectra of the TE waves excited in a Si3N4/Ag heterostructure. Finally, we demonstrate the applications of the lowest-order TE wave excited in a Si3N4/Ag heterostructure in optical display with good chromaticity and optical sensing with high sensitivity.

On the inversion and phase recovery of scattered electromagnetic amplitude data

1989 ◽  
Vol 426 (1871) ◽  
pp. 361-375 ◽  
Keyword(s):  
Electromagnetic Scattering ◽  
Transverse Electric ◽  
Complex Structure ◽  
Polarization State ◽  
Scattering Problem ◽  
Transverse Magnetic ◽  
One Dimensional ◽  
Amplitude Data ◽  
Transverse Magnetic Polarization ◽  
The One

The one-dimensional inverse electromagnetic scattering problem for the inversion of amplitude data of either linear polarization state is investigated. The method exploits the complex structure of the field scattered from a class of inhomogeneous dielectrics and enables the analytic signal to be reconstructed from measurements of the amplitude alone. The method is demonstrated and exemplified with experimental data in both transverse electric and transverse magnetic polarization states. The implications of the method as a means for regularization of scattered data are briefly discussed.

scholarly journals Free space transmission lines in receiving antenna operation

2019 ◽  
Author(s):  
Reuven Ianconescu ◽  
Vladimir Vulfin
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Incident Wave ◽  
Transmission Lines ◽  
Incident Plane Wave ◽  
Software Simulation ◽  
Incident Plane ◽  
Receiving Antenna ◽  
Scattering Matrices ◽  
Simulation Results

This work derives exact expressions for the voltage and current induced into a two conductors non isolated transmission lines by an incident plane wave. The methodology is to use the transmission line radiating properties to derive scattering matrices and make use of reciprocity to derive the response to the incident wave. The analysis is in the frequency domain and it considers transmission lines of any small electric cross section, incident by a plane wave from any incident direction and any polarisation. The analytic results are validated by successful comparison with ANSYS commercial software simulation results, and compatible with other published results.

scholarly journals Acoustic integrated extinction

2015 ◽  
Vol 471 (2177) ◽  
pp. 20150008 ◽  
Author(s):  
Andrew N. Norris
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Acoustic Scattering ◽  
Forward Direction ◽  
Time Dependent ◽  
Incident Plane Wave ◽  
Scattering Function ◽  
Long Wavelength ◽  
Incident Plane ◽  
Finite Integral

The integrated extinction (IE) is defined as the integral of the scattering cross section as a function of wavelength. Sohl et al. (2007 J. Acoust. Soc. Am. 122 , 3206–3210. ( doi:10.1121/1.2801546 )) derived an IE expression for acoustic scattering that is causal, i.e. the scattered wavefront in the forward direction arrives later than the incident plane wave in the background medium. The IE formula was based on electromagnetic results, for which scattering is causal by default. Here, we derive a formula for the acoustic IE that is valid for causal and non-causal scattering. The general result is expressed as an integral of the time-dependent forward scattering function. The IE reduces to a finite integral for scatterers with zero long-wavelength monopole and dipole amplitudes. Implications for acoustic cloaking are discussed and a new metric is proposed for broadband acoustic transparency.

NUMERICAL SOLUTIONS TO ELECTROMAGNETIC SCATTERING FROM STRIPS, FINITE WEDGES, AND NOTCHED CIRCULAR CYLINDERS

1966 ◽  
Vol 44 (12) ◽  
pp. 3217-3225 ◽  
Author(s):  
J. B. Billingsley ◽  
G. Sinclair
Keyword(s):  
Cross Sections ◽  
Electromagnetic Scattering ◽  
Numerical Solutions ◽  
Transverse Electric ◽  
Wedge Angle ◽  
Transverse Magnetic ◽  
Circular Cylinders ◽  
Far Field ◽  
Circular Sector ◽  
Cylinder Axis

Accurate far-field scattering patterns and backscattering cross sections are numerically calculated for perfectly conducting strips, finite (circular sector) wedges, and sectorally notched circular cylinders, all infinitely long, under transverse electric or transverse magnetic plane-wave illumination normally incident to the cylinder axis from any direction. The notch or wedge angle is arbitrary. Results have been obtained for cylinders and wedges of radius as large as five wavelengths, and strips as wide as two wavelengths, without straining an IBM 7094 digital computer.

scholarly journals Nonrigorous symmetric second-order ABC applied to large-domain finite element modeling of electromagnetic scatterers

2016 ◽  
Vol 29 (4) ◽  
pp. 675-688 ◽  
Author(s):  
Slobodan Savic ◽  
Milan Ilic
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Second Order ◽  
Electromagnetic Analysis ◽  
Absorbing Boundary ◽  
Large Domain ◽  
First Order ◽  
New Variables

Nonrigorous symmetric second-order absorbing boundary condition (ABC) is presented as a feasible local mesh truncation in the higher-order large-domain finite element method (FEM) for electromagnetic analysis of scatterers in the frequency domain. The ABC is implemented on large generalized curvilinear hexahedral finite elements without imposing normal field continuity and without introducing new variables. As the extension of our previous work, the method is comprehensively evaluated by analyzing several benchmark targets, i.e., a metallic sphere, a dielectric cube, and NASA almond. Numerical examples show that radar cross section (RCS) of analyzed scatterers can be accurately predicted when the divergence term is included in computations nonrigorously. An influence of specific terms in the second-order ABC, which absorb transverse electric (TE) and transverse magnetic (TM) spherical modes, is also investigated. Examples show significant improvements in accuracy of the nonrigorous second-order ABC over the first-order ABC.

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