Optical theorem for electromagnetic field scattering by dielectric structures and energy emission from the evanescent wave

2005 ◽  
Vol 72 (2) ◽  
Author(s):  
Yu. V. Gulyaev ◽  
Yu. N. Barabanenkov ◽  
M. Yu. Barabanenkov ◽  
S. A. Nikitov
Keyword(s):  
Electromagnetic Field ◽  
Evanescent Wave ◽  
Optical Theorem ◽  
Energy Emission ◽  
Dielectric Structures

scholarly journals Dynamical Manipulation of Surface Plasmon Polaritons

2019 ◽  
Vol 9 (16) ◽  
pp. 3297 ◽  
Author(s):  
Wang ◽  
Zhao ◽  
Li
Keyword(s):  
Electromagnetic Field ◽  
Metal Surface ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Wide Spectrum ◽  
Future Perspectives ◽  
Practical Applications ◽  
Fundamental Research ◽  
Dielectric Structures ◽  
Plasmon Polaritons

As the fundamental and promising branch of nanophotonics, surface plasmon polaritons (SPP) with the ability of manipulating the electromagnetic field on the subwavelength scale are of interest to a wide spectrum of scientists. Composed of metallic or dielectric structures whose shape and position are carefully engineered on the metal surface, traditional SPP devices are generally static and lack tunability. Dynamical manipulation of SPP is meaningful in both fundamental research and practical applications. In this article, the achievements in dynamical SPP excitation, SPP focusing, SPP vortex, and SPP nondiffracting beams are presented. The mechanisms of dynamical SPP devices are revealed and compared, and future perspectives are discussed.

scholarly journals Optimization of the method for exciting an inverted strip dielectric waveguide with metal plane

2019 ◽  
Keyword(s):  
Electromagnetic Field ◽  
Insertion Loss ◽  
Dielectric Waveguide ◽  
Wave Mode ◽  
Dielectric Constants ◽  
Dielectric Waveguides ◽  
Frequency Selection ◽  
Selection Mode ◽  
Functional Units ◽  
Dielectric Structures

Background. Currently, the application of various types of dielectric waveguides in the millimeter wavelength range is very promising, including metal-dielectric structures and functional units based on them. This is due to the simplicity and low cost of manufacturing dielectric waveguides and functional units based on them, the possibility of their integration with active elements, the use of various dielectrics and polymers having both a wide range of dielectric constants and a variety of mechanical properties (in particular, some dielectric materials have significant flexibility).Objectives. To optimize the method of excitation of one of its eigenwaves in a inverted strip dielectric waveguide with a metal plane through a series of physical experiments.Materials and methods. The studied electrodynamic structure belongs to the class of hybrid metal-dielectric structures. Its basis is a inverted strip dielectric waveguide with a metal plane. A feature of the used inverted strip dielectric waveguide is its composition: the main part of the waveguide rod adjacent to the metal plane is made of polystyrene, the second part is made of fluoroplastic. The evaluation of the excitation efficiency was carried out by the magnitude of the introduced attenuation into the tract. Using the method of a moving probe, the degree of concentration of the electromagnetic field near a complex compositional waveguiding rod was estimated. The fields were visualized using the contour method.Results. Based on a series of experimental studies, the method for exciting an inverted strip dielectric waveguide with a metal plane is optimized. The effect of optimal excitation was achieved through the use of the composite design of the dielectric waveguiding rod. With the optimal ratio of the material constants of the layers forming the waveguiding rod and the geometric parameters of these layers, it was possible to significantly expand the working frequency band, within which the level of insertion loss did not exceed the specified values. It was found that the electromagnetic field is concentrated mainly near the dielectric rod, providing a stable wave mode. It has been established that with a certain ratio of structure parameters, the frequency selection mode can be implemented in it. Conclusions. In the course of physical measurements, it was found that a inverted strip dielectric waveguide with a metal plane with the optimal choice of parameters is able to effectively maintain the wave mode with a low level of insertion loss. In general, a structure with a certain choice of parameters can operate in two regimes: waveguiding mode and frequency selection mode.

Electromagnetic Field Distributions in Complex Dielectric Structures

1996 ◽  
pp. 253-260
Author(s):  
P. M. Bell ◽  
L. Martin Moreno ◽  
F. J. Garcia Vidal ◽  
J. B. Pendry
Keyword(s):  
Electromagnetic Field ◽  
Field Distributions ◽  
Dielectric Structures

TRAPPING COLD ATOMS BY A CARBON NANOTUBE

2011 ◽  
Vol 25 (12n13) ◽  
pp. 979-985 ◽  
Author(s):  
T. A. CHU ◽  
D. T. NGA ◽  
T. T. THAO ◽  
V. THANH NGO ◽  
N. A. VIET
Keyword(s):  
Electromagnetic Field ◽  
Carbon Nanotube ◽  
Optical Fiber ◽  
Boundary Conditions ◽  
Evanescent Wave ◽  
Cold Atoms ◽  
Cold Atom ◽  
Bound State ◽  
Attractive Potential ◽  
Bound State Solution

A new model of cold atoms trap using a carbon nanotube is proposed. In this model, for the existence of a stable bound state of cold atom, we send a strong electromagnetic field through the carbon nanotube. This field generates an evanescent wave around the carbon nanotube and creates an effective attractive potential. The consideration of some possible boundary conditions leads to this non-trivial bound state solution. We compare also our result to the two most recent models concerning trapping of cold atoms by using a charged carbon nanotube and an optical fiber.

Energy emission from evanescent wave and interference of opposite wave streams

2007 ◽  
Vol 364 (5) ◽  
pp. 421-424 ◽  
Author(s):  
M.Yu. Barabanenkov ◽  
Yu.N. Barabanenkov ◽  
Yu.V. Gulyaev ◽  
S.A. Nikitov
Keyword(s):  
Evanescent Wave ◽  
Energy Emission ◽  
Opposite Wave

Single Atom Image Contrast in Fixed Beam Dark Field Electron Microscopy

1974 ◽  
Vol 32 ◽  
pp. 366-367
Author(s):  
Wah Chi
Keyword(s):  
Scattering Amplitude ◽  
Present Report ◽  
Dark Field ◽  
Image Contrast ◽  
Single Atom ◽  
Optical Theorem ◽  
Hartree Fock ◽  
Heavy Atoms ◽  
Beam Stop ◽  
Fixed Beam

Resolution and contrast are the important factors to determine the feasibility of imaging single heavy atoms on a thin substrate in an electron microscope. The present report compares the atom image characteristics in different modes of fixed beam dark field microscopy including the ideal beam stop (IBS), a wire beam stop (WBS), tilted illumination (Tl) and a displaced aperture (DA). Image contrast between one Hg and a column of linearly aligned carbon atoms (representing the substrate), are also discussed. The assumptions in the present calculations are perfectly coherent illumination, atom object is represented by spherically symmetric potential derived from Relativistic Hartree Fock Slater wave functions, phase grating approximation is used to evaluate the complex scattering amplitude, inelastic scattering is ignored, phase distortion is solely due to defocus and spherical abberation, and total elastic scattering cross section is evaluated by the Optical Theorem. The atom image intensities are presented in a Z-modulation display, and the details of calculation are described elsewhere.

Comparison of high- and low-frequency electromagnetic field analysis

1993 ◽  
Vol 3 (3) ◽  
pp. 363-371 ◽  
Author(s):  
A. Konrad ◽  
I. A. Tsukerman
Keyword(s):  
Electromagnetic Field ◽  
Low Frequency ◽  
Field Analysis
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