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Excitation of magnetoacoustic waves by two microwave beams in InSb
Author(s) -
Maheshwari K. P.,
Tarey Ganesh
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221160140
Subject(s) - physics , excitation , excited state , microwave , magnetic field , ponderomotive force , dispersion relation , atomic physics , optics , quantum mechanics
An investigation is made of the resonant excitation of magnetoacoustic wave at the difference frequency of two microwave beams propagating in a magnetoactive solid state plasma viz. n‐InSb. Due to the interaction of the two waves in the semiconductor the ponderomotive force at the difference frequency becomes finite and generates a magnetoacoustic wave if the dispersion relation corresponding to magnetoacoustic wave is satisfied. The analysis shows that there is a finite probability of excitation of an acoustic wave alongwith the magnetoacoustic wave. The excited acoustic and magnetoacoustic waves couple at magnetic fields when the thermal pressure is equivalent to the magnetic pressure. The propagation characteristics of the coupled wave are also studied. The results show that microwave beams of power densities 1 MW cm −2 excite magnetoacoustic wave of power density 0.04 kW cm −2 when ω c /ω = 0.1. The increase in magnetic field increases the power density of the excited magnetoacoustic wave whereas it tends to reduce the refractive index and attenuation constant of the coupled wave.