The purpose of the present paper is to report the study on modulational amplification in diffusive semiconductors including hot carrier effects. Considering that the origin of modulational interaction lies in the third-order optical susceptibility c (3) arising from the nonlinear diffusion current density and using coupled mode theory, an analytical investigation of frequency modulational interaction between co-propagating laser beams and internally generated acoustic mode is presented. We have studied the steady state and transient amplification characteristics of modulated waves arising in diffusive semiconductor plasmas. The effect of carrier heating adds new dimensions to the present study. The heating effect reduces the required threshold amplitude of wave and enhances steady-state as well as transient gain of the generated acoustic mode.Keywords : High-field and nonlinear effects (Hot carrier), nonlinear phenomena : waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.), diffusion in solids, Piezo-, elasto-, and acousto-optical effects.
Dispersion and absorption characteristics of electrokinetic wave in unmagnetised extrinsic semiconductor with streaming carriers are analytically investigated. By using quantum hydrodynamic model, a linear dispersion relation is derived for longitudinal electrokinetic wave in colloids laden semiconductor plasma under slow electrokinetic mode regime. Results indicate that quantum effect through Bohm potential significantly modifies the dispersion and absorption characteristics of electrokinetic wave spectrum. The outcome is hoped to add substantially to the present knowledge of wave spectrum of longitudinal electrokinetic wave in colloids laden quantum semiconductor plasma subjected to a dc electric field along the direction of wave propagation.
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