Diffraction of Electromagnetic Waves by a Semi-Infinite Screen in a Layered Medium

1975 ◽  
Vol 53 (14) ◽  
pp. 1305-1317 ◽  
Author(s):  
Wiebe G. Heitman ◽  
P. M. van den Berg
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Power Flow ◽  
Layered Medium ◽  
Plane Electromagnetic Wave ◽  
Flow Density ◽  
Two Dimensional ◽  
Electromagnetic Power

The diffraction of a plane electromagnetic wave by a semi-infinite screen in one of the plane interfaces of a layered medium is investigated theoretically. The screen of vanishing thickness is assumed to be electrically perfectly conducting. Two separate two dimensional scalar problems are dealt with, viz. the case of E polarization and H polarization. The resulting unknown field functions are determined with the aid of the Wiener–Hopf technique. Subsequently, the electromagnetic power flow density is calculated at different locations and as a function of the electromagnetic contrast of the different media.

Spectral theory of diffraction of electromagnetic waves by a strip in the plane interface of two semi-infinite media

1979 ◽  
Vol 57 (8) ◽  
pp. 1148-1156 ◽  
Author(s):  
J. M. van Splunter ◽  
P. M. van den Berg
Keyword(s):  
Fourier Transform ◽  
Electromagnetic Waves ◽  
Power Flow ◽  
Plane Electromagnetic Wave ◽  
Plane Waves ◽  
Surface Current ◽  
Iteration Scheme ◽  
Plane Interface ◽  
Flow Density ◽  
Infinite Media

The diffraction of a plane electromagnetic wave by a cylindrical strip in the plane interface of two semi-infinite media has been investigated. For both the case of E polarization and the case of H polarization, the scattered field is written as a continuous superposition of plane waves (spatial Fourier type of integral). The complex amplitudes of these waves are directly related to the spatial Fourier transform of the surface current on the strip. In order to determine the surface current, a relatively simple iteration scheme has been developed. At the numerical calculations we successfully take advantage of the presence of a Fast Fourier Transform procedure. Numerical results pertaining to the power flow density are presented at different locations and as a function of the width of the strip. Furthermore, the scattering cross section of the strip, as a function of the electromagnetic contrast of the different media, is calculated.

Bateman electromagnetic waves

1984 ◽  
Vol 396 (1810) ◽  
pp. 199-204 ◽  
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Plane Electromagnetic Wave ◽  
Flat Space ◽  
Space Time

It is proved that in flat space-time every electromagnetic wave is a Bateman wave and, as a corollary, that every plane electromagnetic wave is a Synge wave.

scholarly journals Near-zero-index media as electromagnetic ideal fluids

2020 ◽  
Vol 117 (39) ◽  
pp. 24050-24054
Author(s):  
Iñigo Liberal ◽  
Michaël Lobet ◽  
Yue Li ◽  
Nader Engheta
Keyword(s):  
Optical Interconnects ◽  
Electromagnetic Waves ◽  
Power Flow ◽  
Optical Systems ◽  
Dielectric Particles ◽  
Electromagnetic Power ◽  
Interesting Connection ◽  
Ideal Fluids ◽  
Local Properties ◽  
Zero Index

Near-zero-index (NZI) supercoupling, the transmission of electromagnetic waves inside a waveguide irrespective of its shape, is a counterintuitive wave effect that finds applications in optical interconnects and engineering light–matter interactions. However, there is a limited knowledge on the local properties of the electromagnetic power flow associated with supercoupling phenomena. Here, we theoretically demonstrate that the power flow in two-dimensional (2D) NZI media is fully analogous to that of an ideal fluid. This result opens an interesting connection between NZI electrodynamics and fluid dynamics. This connection is used to explain the robustness of supercoupling against any geometrical deformation, to enable the analysis of the electromagnetic power flow around complex geometries, and to examine the power flow when the medium is doped with dielectric particles. Finally, electromagnetic ideal fluids where the turbulence is intrinsically inhibited might offer interesting technological possibilities, e.g., in the design of optical forces and for optical systems operating under extreme mechanical conditions.

scholarly journals Plane electromagnetic waves in heterogeneous medium under approximation regarding relative rate of change of wave resistance

1993 ◽  
Vol 11 (4) ◽  
pp. 679-684
Author(s):  
Nikolai E. Tsapenko
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Heterogeneous Medium ◽  
Relative Rate ◽  
Plane Electromagnetic Wave ◽  
Wave Resistance ◽  
Rate Of Change ◽  
Wkb Approximation ◽  
Approximate Representation ◽  
Fixed Direction

In this article, we derived new formulas for approximate representation of components of a plane electromagnetic wave in heterogeneous medium that has parameters changing along some fixed direction in an arbitrary manner. The formulas differ from ordinary WKB approximation by factors regarding relative rate of medium characteristics change and give solutions remaining continuous at turning points. Conditions of full opaque and of no reflectionbased on the solution are obtained.

scholarly journals ADE-FDTD method for study of two-dimensional electromagnetic wave propagation in lossy lorentz medium

2020 ◽  
Vol 309 ◽  
pp. 01002
Author(s):  
Bingkang Chen
Keyword(s):  
Electromagnetic Wave ◽  
Plane Electromagnetic Wave ◽  
Fdtd Method ◽  
Two Dimensional ◽  
One Dimensional ◽  
Coefficient Of Reflection ◽  
Difference Formula ◽  
Medium Layer ◽  
The Difference ◽  
Difference Time

In order to study the reflection of electromagnetic wave in Lorentz medium layer, the finite difference time domain method of auxiliary differential equation (ADE-FDTD) is used to derive the difference formula of two-dimensional TM wave propagating in lossy Lorentz medium, and the reflection coefficient of reflection field is calculated in one-dimensional case. The calculated reflection coefficients coincide very well, which shows that the derived propagation formula of two-dimensional TM wave in lossy Lorentz medium is correct. In addition, the reflection of plane electromagnetic wave by infinite high Lorentz medium layer is also simulated. The results show that the reflection of plane electromagnetic wave by Lorentz dispersive medium layer is correct.

Detection of delamination in composites by using electromagnetic penetrating radar

2014 ◽  
Vol 5 (2) ◽  
pp. 151-156
Author(s):  
Z. Mechbal ◽  
A. Khamlichi
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Wave Reflection ◽  
Image Features ◽  
Partial Reflection ◽  
Straight Path ◽  
Reflected Signal ◽  
Short Time ◽  
Intervening Factors

Composites made from E-glass/epoxy or aramid/epoxy are frequently used in aircraft and aerospace industries. These materials are prone to suffer from the presence of delamination, which can reduce severely the performance of aircrafts and even threaten their safety. Since electric conductivity of these composites is rather small, they can propagate electromagnetic waves. Detection of delamination damage can then be monitored by using an electromagnetic penetrating radar scanner, which consists of emitting waves having the form of short time pulses that are centered on a given work frequency. While propagating, these waves undergo partial reflection when running into an obstacle or a material discontinuity. Habitually, the radar is moved at constant speed along a straight path and the reflected signal is processed as a radargram that gives the reflected energy as function of the two-way time and the antenna position.In this work, modeling of electromagnetic wave propagation in composites made from E-glass/epoxy was performed analytically. The electromagnetic wave reflection from a delamination defect was analyzed as function of key intervening factors which include the defect extent and depth, as well as the work frequency. Various simulations were performed and the obtained results have enabled to correlate the reflection pattern image features to the actual delamination defect characteristics which can provide quantification of delamination.

New Approach to the Theory of Circular Dichroism

1998 ◽  
Vol 63 (8) ◽  
pp. 1187-1201 ◽  
Author(s):  
Jaroslav Zamastil ◽  
Lubomír Skála ◽  
Petr Pančoška ◽  
Oldřich Bílek
Keyword(s):  
Electromagnetic Wave ◽  
Circular Dichroism ◽  
Electromagnetic Waves ◽  
Maxwell Equations ◽  
Optically Active ◽  
Semiclassical Approach ◽  
New Approach ◽  
Isotropic Media ◽  
New Formula ◽  
Circular Dichroïsm

Using the semiclassical approach for the description of the propagation of the electromagnetic waves in optically active isotropic media we derive a new formula for the circular dichroism parameter. The theory is based on the idea of the time damped electromagnetic wave interacting with the molecules of the sample. In this theory, the Lambert-Beer law need not be taken as an empirical law, however, it follows naturally from the requirement that the electromagnetic wave obeys the Maxwell equations.

scholarly journals Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

2020 ◽  
Vol 9 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Shumin Du ◽  
Huaiyin Chen ◽  
Ruoyu Hong
Keyword(s):  
Electromagnetic Wave ◽  
Environmental Pollution ◽  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Rapid Development ◽  
Living Environment ◽  
World Health ◽  
Electromagnetic Properties ◽  
Strontium Hexaferrite ◽  
Wave Radiation

AbstractWith the rapid development of electronics and information technology, electronics and electrical equipment have been widely used in our daily lives. The living environment is full of electromagnetic waves of various frequencies and energy. Electromagnetic wave radiation has evolved into a new type of environmental pollution that has been listed by the WHO (World Health Organization) as the fourth largest source of environmental pollution after water, atmosphere, and noise. Studies have shown that when electromagnetic wave radiation is too much, it can cause neurological disorders. And electromagnetic interference will cause the abnormal operation of medical equipment, precision instruments and other equipment, and therefore cause incalculable consequences. Therefore, electromagnetic protection has become a hot issue of concern to the social and scientific circles.

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