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
Published online: 19 July 2002
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