On the Reflection of Electromagnetic Waves from a Medium Excited by Acoustic Waves

1960 ◽  
Vol 31 (2) ◽  
pp. 439-440 ◽  
Author(s):  
Hans J. Schmitt ◽  
Dipak L. Sengupta
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves

Numerical simulation for coupled nonlinear Schrödinger–Korteweg–de Vries and Maccari systems of equations

2021 ◽  
pp. 2150339
Author(s):  
Lanre Akinyemi ◽  
Pundikala Veeresha ◽  
Samuel Oluwatosin Ajibola
Keyword(s):  
Numerical Simulation ◽  
Plasma Physics ◽  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Nonlinear Partial Differential Equations ◽  
Transform Method ◽  
Langmuir Waves ◽  
Suggested Approach ◽  
Nonlinear Schrödinger ◽  
De Vries

The primary goal of this paper is to seek solutions to the coupled nonlinear partial differential equations (CNPDEs) by the use of q-homotopy analysis transform method (q-HATM). The CNPDEs considered are the coupled nonlinear Schrödinger–Korteweg–de Vries (CNLS-KdV) and the coupled nonlinear Maccari (CNLM) systems. As a basis for explaining the interactive wave propagation of electromagnetic waves in plasma physics, Langmuir waves and dust-acoustic waves, the CNLS-KdV model has emerged as a model for defining various types of wave phenomena in mathematical physics, and so forth. The CNLM model is a nonlinear system that explains the dynamics of isolated waves, restricted in a small part of space, in several fields like nonlinear optics, hydrodynamic and plasma physics. We construct the solutions (bright soliton) of these models through q-HATM and present the numerical simulation in form of plots and tables. The solutions obtained by the suggested approach are provided in a refined converging series. The outcomes confirm that the proposed solutions procedure is highly methodological, accurate and easy to study CNPDEs.

scholarly journals Realization of acoustic spin transport in metasurface waveguides

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yang Long ◽  
Danmei Zhang ◽  
Chenwen Yang ◽  
Jianmin Ge ◽  
Hong Chen ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Degrees Of Freedom ◽  
Transport Processes ◽  
Angular Momenta ◽  
Transverse Electromagnetic ◽  
Spin Texture ◽  
Momentum Coupling ◽  
Practical Implications ◽  
Spin Momentum

Abstract Spin angular momentum enables fundamental insights for topological matters, and practical implications for information devices. Exploiting the spin of carriers and waves is critical to achieving more controllable degrees of freedom and robust transport processes. Yet, due to the curl-free nature of longitudinal waves distinct from transverse electromagnetic waves, spin angular momenta of acoustic waves in solids and fluids have never been unveiled only until recently. Here, we demonstrate a metasurface waveguide for sound carrying non-zero acoustic spin with tight spin-momentum coupling, which can assist the suppression of backscattering when scatters fail to flip the acoustic spin. This is achieved by imposing a soft boundary of the π reflection phase, realized by comb-like metasurfaces. With the special-boundary-defined spin texture, the acoustic spin transports are experimentally manifested, such as the suppression of acoustic corner-scattering, the spin-selected acoustic router with spin-Hall-like effect, and the phase modulator with rotated acoustic spin.

Resonant electromagnetic wave mixing in a dusty plasma

1996 ◽  
Vol 55 (3) ◽  
pp. 349-358 ◽  
Author(s):  
Jin-Xiu Ma ◽  
M. Y. Yu ◽  
P. K. Shukla
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Phase Conjugation ◽  
Four Wave Mixing ◽  
Dusty Plasmas ◽  
Wave Mixing ◽  
Ion Acoustic Waves ◽  
Charge Fluctuations ◽  
Dust Charge ◽  
Dust Charge Fluctuations

Wave mixing resulting from the resonance of electromagnetic waves with ion acoustic waves modified by dust charge fluctuations is investigated. The corresponding nonlinear susceptibilities are derived and applied to the study of phase conjugation by four-wave mixing. It is shown that dust charge fluctuations can lead to a filling-up of the resonance-induced splitting of the phase-conjugate reflectivity, making the latter a useful tool for the diagnostics of dusty plasmas.

The role of electromagnetic waves in the reflection of acoustic waves in piezoelectric crystals

Wave Motion ◽  
2008 ◽  
Vol 45 (4) ◽  
pp. 428-444 ◽  
Author(s):  
A.N. Darinskii ◽  
E. Le Clezio ◽  
G. Feuillard
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Piezoelectric Crystals

scholarly journals The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Maryamsadat Rafiei ◽  
Mostafa Sahrai ◽  
Mahboub Hosseinpour ◽  
Abdolrasoul Esfandyari-Kalejahi
Keyword(s):  
Electron Beam ◽  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Second Harmonic ◽  
Coupling Mechanism ◽  
Electron Mass ◽  
Mass Ratio ◽  
Electron Stream ◽  
Beam Plasma ◽  
Electron Beam Plasma

Two-dimensional electromagnetic particle-in-cell simulations are carried out to investigate the effect of ion-to-electron mass ratio on the evolution of warm electron beam-plasma instability. Four cases are considered: A: mi/me = 0 (two-electron stream instability); B: mi/me = 1 (pair plasma); C: mi/me = 100; and D: mi/me = 1000. It is shown that the generation of Langmuir waves in the fundamental mode of electron plasma frequency and the subsequent dynamics of large-amplitude solitons are not affected by the ion species. However, it determines the decay process of solitons and the excitation of electromagnetic waves in the second harmonic. In the first two cases, mi/me = 0 and 1, there is no sign of emission in the second harmonic, while the strongest emission in the second harmonic is found for the case of largest mass ratio, mi/me = 1000. This confirms the two-step wave-wave coupling mechanism for the generation of second harmonic electromagnetic waves, which requires the excitation of ion-acoustic waves in the first step. Moreover, the dispersion diagrams of all excited waves are presented.

scholarly journals Recent Advances in Non-Traditional Elastic Wave Manipulation by Macroscopic Artificial Structures

2020 ◽  
Vol 10 (2) ◽  
pp. 547 ◽  
Author(s):  
Jeonghoon Park ◽  
Dongwoo Lee ◽  
Junsuk Rho
Keyword(s):  
Elastic Wave ◽  
Elastic Waves ◽  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Gradient Index ◽  
Bragg Scattering ◽  
Elastic Materials ◽  
Artificial Structures ◽  
Elastic Metamaterials ◽  
Gradient Index Lens

Metamaterials are composed of arrays of subwavelength-sized artificial structures; these architectures give rise to novel characteristics that can be exploited to manipulate electromagnetic waves and acoustic waves. They have been also used to manipulate elastic waves, but such waves have a coupling property, so metamaterials for elastic waves uses a different method than for electromagnetic and acoustic waves. Since researches on this type of metamaterials is sparse, this paper reviews studies that used elastic materials to manipulate elastic waves, and introduces applications using extraordinary characteristics induced by metamaterials. Bragg scattering and local resonances have been exploited to introduce a locally resonant elastic metamaterial, a gradient-index lens, a hyperlens, and elastic cloaking. The principles and applications of metasurfaces that can overcome the disadvantages of bulky elastic metamaterials are discussed.

scholarly journals Capacity Estimation of the Very Short-Range Electromagnetic Underwater Channel Based on Measurements

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Jesús López-Fernández ◽  
Unai Fernández-Plazaola ◽  
Jose F. Paris
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Short Range ◽  
Oil And Gas ◽  
Sea Water ◽  
Water Movement ◽  
Propagation Speed ◽  
Ergodic Capacity ◽  
Transmitter Power ◽  
Offshore Oil And Gas

The significant attenuation experienced by electromagnetic waves in sea water is the main reason why acoustic waves are generally preferred in underwater communication. Nevertheless, acoustic waves have various drawbacks. For example, they are negatively affected by factors such as mechanical noise, slow propagation speed, and, particularly, low bandwidth, which leads to digital links at a lower bit rate. However, in short-range links, these problems can be overcome by reconsidering the use of electric current communications. For instance, data collected by remote-control vehicles in offshore oil and gas and renewable energy plants can be transmitted at distances of even 1 m or less. This study uses previous frequency response measurements taken in deep water to explore the capacity of a short-range electromagnetic underwater channel. Because of water movement, the nonstatic position of the vehicle when the transmission occurs means that the channel is regarded as randomly time-variant. A statistical model is proposed and the ergodic capacity is calculated for a 7 MHz bandwidth channel at distances ranging from 0.5 m to 5 m as well as for different values of transmitter power. The results of this study reflect capacity values of tens of kbps at distances of approximately 5 m to several Mbps at distances of less than 1.5 m.

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