https://doi.org/10.1140/epjd/e2002-00128-9
Acousto-optic amplitude modulation and demodulation of electromagnetic wave in magnetised diffusive semiconductors
School of Studies in Physics, Vikram University, Ujjain-456010, Madhya Pradesh, India
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Received:
28
February
2002
Published online:
19
July
2002
Abstract
Using hydrodynamical model of semiconductor plasma analytical
investigations are made for the amplitude modulation as well as demodulation of an
electromagnetic wave in a transversely magnetised acousto-optic semiconducting
plasma. The inclusion of carriers diffusion adds new dimension in the analysis
presented here. Analysis are made under different wave number regions over a wide
range of cyclotron frequency. It has been seen that diffusion of charge carriers
modifies amplitude modulation and demodulation processes effectively. Numerical
estimations are made for n-InSb crystal irradiated by pump wave of frequency 1.6 T s-1. Complete absorption of the waves takes place in all the possible wave lengths regimes when the cyclotron frequency 
becomes exactly equal to
.
PACS: 52.35.Mw – Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.) / 78.20.Hp – Piezo-, elasto-, and acoustooptical effects; photoacoustic effects / 72.30.+q – High-frequency effects; plasma effects / 42.70.Nq – Other nonlinear optical materials; photorefractive and semiconductor materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
