scholarly journals Multipolar interference effects in nanophotonics

2017 ◽  
Vol 375 (2090) ◽  
pp. 20160317 ◽  
Author(s):  
Wei Liu ◽  
Yuri S. Kivshar
Keyword(s):  
Electromagnetic Field ◽  
Radiation Pattern ◽  
Electromagnetic Waves ◽  
Brewster Angle ◽  
Interference Effects ◽  
Scattering Intensity ◽  
New Horizons ◽  
Comprehensive View ◽  
Nanoscale Object

Scattering of electromagnetic waves by an arbitrary nanoscale object can be characterized by a multipole decomposition of the electromagnetic field that allows one to describe the scattering intensity and radiation pattern through interferences of dominating multipole modes excited. In modern nanophotonics, both generation and interference of multipole modes start to play an indispensable role, and they enable nanoscale manipulation of light with many related applications. Here, we review the multipolar interference effects in metallic, metal–dielectric and dielectric nanostructures, and suggest a comprehensive view on many phenomena involving the interferences of electric, magnetic and toroidal multipoles, which drive a number of recently discussed effects in nanophotonics such as unidirectional scattering, effective optical antiferromagnetism, generalized Kerker scattering with controlled angular patterns, generalized Brewster angle, and non-radiating optical anapoles. We further discuss other types of possible multipolar interference effects not yet exploited in the literature and envisage the prospect of achieving more flexible and advanced nanoscale control of light relying on the concepts of multipolar interference through full phase and amplitude engineering. This article is part of the themed issue ‘New horizons for nanophotonics’.

Propagation of ultrashort optical pulses in anisotropic optical media with carbon nanotubes

2021 ◽  
pp. 2150197
Author(s):  
N. N. Konobeeva ◽  
M. B. Belonenko
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Field ◽  
Vector Potential ◽  
Pulse Shape ◽  
Electromagnetic Waves ◽  
Optical Pulses ◽  
Effective Equation ◽  
Ultrashort Optical Pulses ◽  
Optical Media ◽  
Crystal Type

In this paper, we investigate the evolution of electromagnetic waves in a nonlinear anisotropic optical medium with carbon nanotubes (CNTs). Based on Maxwell’s equation, an effective equation is obtained for the vector potential of the electromagnetic field, which takes into account different values of the velocity and polarization with two directions. The dependence of the pulse shape on the crystal type, as well as the angle between the electric field and the CNTs axis is revealed.

scholarly journals Analysis on the Influence of Transmission Lines span on Passive Interference in Shortwave

2018 ◽  
Vol 64 ◽  
pp. 05004
Author(s):  
Ying Lu ◽  
Zhibin Zhao ◽  
Jian gong Zhang ◽  
Zheyuan Gan
Keyword(s):  
Electromagnetic Field ◽  
Transmission Line ◽  
Transmission Lines ◽  
Electromagnetic Scattering ◽  
Electromagnetic Waves ◽  
Short Wave ◽  
Critical Distance ◽  
Observation Point ◽  
Radio Station ◽  
Passive Interference

The passive interference of transmission lines to nearby radio stations may affect the effective reception and transmission of radio station signals. Therefore, the accurate calculation of the electromagnetic scattering of transmission lines under the condition of external electromagnetic waves is the basis for determining the reasonable avoidance spacing of the two. For passive stations operating in short-wave frequencies, passive interference is mainly generated by the tower, and span is one of the most significant factors affecting passive interference. This paper uses the method of moments to carry out the passive interference calculations under normal circumstances, expounds the method of calculating the electromagnetic field of transmission line at the same time. And elaborates the method for calculating the electromagnetic field of the transmission line, obtains the space electric field intensity of the transmission line at the same working frequency and space location of the plane wave. Applying the approximate formula to calculate the formula for the span and critical distance between the observation point and the transmission line.

scholarly journals Special Issue: New Horizon of Plasmonics and Metamaterials

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1756
Author(s):  
Shinpei Ogawa ◽  
Masafumi Kimata
Keyword(s):  
Electromagnetic Waves ◽  
New Technologies ◽  
Special Issue ◽  
Practical Applications ◽  
New Horizons ◽  
Fundamental Knowledge ◽  
Recent Advances ◽  
Wide Range ◽  
Remarkable Progress

Plasmonics and metamaterials are growing fields that consistently produce new technologies for controlling electromagnetic waves. Many important advances in both fundamental knowledge and practical applications have been achieved in conjunction with a wide range of materials, structures and wavelengths, from the ultraviolet to the microwave regions of the spectrum. In addition to this remarkable progress across many different fields, much of this research shares many of the same underlying principles, and so significant synergy is expected. This Special Issue introduces the recent advances in plasmonics and metamaterials and discusses various applications, while addressing a wide range of topics in order to explore the new horizons emerging for such research.

scholarly journals On the multipath effects due to wall reflections for wave reception in a corner

Noise Mapping ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 41-64
Author(s):  
Luiz Manuel Braga da Costa Campos ◽  
Manuel José dos Santos Silva ◽  
Agostinho Rui Alves da Fonseca
Keyword(s):  
Electromagnetic Waves ◽  
Double Series ◽  
Two Dimensions ◽  
Reflection Coefficients ◽  
Urban Air ◽  
Interference Effects ◽  
Direct Signal ◽  
Total Signal ◽  
Spectral Bands ◽  
Multipath Effects

Abstract Multipath effects occur when receiving a wave near a corner, for example, the noise of an helicopter or an aircraft or a drone or other forms of urban air mobility near a building, or a telecommunications receiver antenna near an obstacle. The total signal received in a corner consists of four parts: (i) a direct signal from source to observer; (ii) a second signal reflected on the ground; (iii) a third signal reflected on the wall; (iv) a fourth signal reflected from both wall and ground. The problem is solved in two-dimensions to specify the total signal, whose ratio to the direct signal specifies the multipath factor. The amplitude and phase of the multipath factor are plotted as functions of the frequency over the audible range, for various relative positions of observer and source, and for several combinations of the reflection coefficients of the ground and wall. It is shown that the received signal consists of a double series of spectral bands, in other words: (i) the interference effects lead to spectral bands with peaks and zeros; (ii) the successive peaks also go through zeros and “peaks of the peaks”. The results apply not only to sound, but also to other waves, e.g., electromagnetic waves using the corresponding frequency band and reflection factors.

Interference effects in the Raman scattering intensity from thin films

1989 ◽  
Vol 28 (18) ◽  
pp. 4017 ◽  
Author(s):  
M. Ramsteiner ◽  
C. Wild ◽  
J. Wagner
Keyword(s):  
Thin Films ◽  
Raman Scattering ◽  
Interference Effects ◽  
Scattering Intensity

scholarly journals Beam generations of three kinds of charged particles

1991 ◽  
Vol 9 (1) ◽  
pp. 149-165 ◽  
Author(s):  
K. Niu ◽  
P. Mulser ◽  
L. Drska
Keyword(s):  
Electromagnetic Field ◽  
Electron Beam ◽  
Electromagnetic Waves ◽  
Laser Light ◽  
Ion Beam ◽  
Charged Particles ◽  
Leading Edge ◽  
Heavy Ion ◽  
Ion Beams ◽  
Damping Force

Analyses are given for beam generations of three kinds of charged particles: electrons, light ions, and heavy ions. The electron beam oscillates in a dense plasma irradiated by a strong laser light. When the frequency of laser light is high and its intensity is large, the acceleration of oscillating electrons becomes large and the electrons radiate electromagnetic waves. As the reaction, the electrons feel a damping force, whose effect on oscillating electron motion is investigated first. Second, the electron beam induces the strong electromagnetic field by its self-induced electric current density when the electron number density is high. The induced electric field reduces the oscillation motion and deforms the beam.In the case of a light ion beam, the electrostatic field, induced by the beam charge, as well as the electromagnetic field, induced by the beam current, affects the beam motion. The total energy of the magnetic field surrounding the beam is rather small in comparison with its kinetic energy.In the case of heavy ion beams the beam charge at the leading edge is much smaller in comparison with the case of light ion beams when the heavy ion beam propagates in the background plasma. Thus, the induced electrostatic and electromagnetic fields do not much affect the beam propagation.

Eigenvalues of the axially symmetrical electromagnetic waves along an infinitely long and conductive circular cylinder in a homogeneous magnetoionic medium

1969 ◽  
Vol 47 (11) ◽  
pp. 1159-1166 ◽  
Author(s):  
K. Aoki
Keyword(s):  
Electromagnetic Field ◽  
Circular Cylinder ◽  
Electromagnetic Waves ◽  
Cyclotron Frequency ◽  
Numerical Results ◽  
Complex Conjugate ◽  
Field Frequency ◽  
Radial Propagation

This paper discusses eigenvalues of the electromagnetic field along an infinitely long and conductive circular cylinder imbedded in a magnetoionic medium under assumptions that the medium is lossless and the field frequency is not equal to the cyclotron frequency. It is shown that they are classified into two kinds: (i) k1 and k2 are pure imaginary and (ii) k22 = (complex conjugate of k12), where k1 and k2 are the radial propagation constants and that no eigenvalues exist in the region bounded by [Formula: see text] where ωp and ωc are the plasma and cyclotron frequencies normalized to the field frequency. Some numerical results in the case of (radius of the cylinder/wavelength) [Formula: see text] are also shown.

scholarly journals Using the Carotazh Method to Determine the Electrical Characteristics of the Earth’s Subsoil

2021 ◽  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Surface Impedance ◽  
Electromagnetic Waves ◽  
Dielectric Permeability ◽  
Electrical Characteristics ◽  
Measuring Systems ◽  
The Earth ◽  
The Magnetic Field

Logging is a detailed study of the structure of the well incision by descent and ascent of a geophysical probe. It is often used to determine the electrical conductivity of terrestrial depths. To do this, the sides of the well deepen the electrodes, and they are fed into the depths of a constant electric current. However, if you use natural or artificial electromagnetic waves, it becomes possible to determine the dielectric permeability of terrestrial rocks at depth. To do this, the surface impedance is first measured on the surface of the earth, and then by measuring at a certain frequency of the electromagnetic field in the well hole, the electrical conductivity and dielectric permeability of terrestrial rocks are calculated by fairly simple formulas. Such measurements can be carried out by standard measuring systems, adding only a narrow frame with wire winding to measure the magnetic field.

scholarly journals Quantum Optics with Giant Atoms—the First Five Years

2020 ◽  
pp. 125-146 ◽  
Author(s):  
Anton Frisk Kockum
Keyword(s):  
Electromagnetic Field ◽  
Quantum Optics ◽  
Experimental Results ◽  
Interference Effects ◽  
Multiple Points ◽  
Artificial Atoms ◽  
Superconducting Circuits ◽  
Recent Advances

Abstract In quantum optics, it is common to assume that atoms can be approximated as point-like compared to the wavelength of the light they interact with. However, recent advances in experiments with artificial atoms built from superconducting circuits have shown that this assumption can be violated. Instead, these artificial atoms can couple to an electromagnetic field at multiple points, which are spaced wavelength distances apart. In this chapter, we present a survey of such systems, which we call giant atoms. The main novelty of giant atoms is that the multiple coupling points give rise to interference effects that are not present in quantum optics with ordinary, small atoms. We discuss both theoretical and experimental results for single and multiple giant atoms, and show how the interference effects can be used for interesting applications. We also give an outlook for this emerging field of quantum optics.

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