NONLINEAR PROPAGATION OF ELECTROMAGNETIC BEAM IN DUSTY PLASMAS

Abstract

This doctoral thesis focuses on nonlinear propagation of electromagnetic beam in dusty plasmas. In first case, we present a model theoretically to see the results of propagation of Gaussian electromagnetic wave in fully ionized dusty plasma on account of energy loss in thermal conduction. We observed the temporal change in plasma parameters, self-focusing of wave and critical power of self-focusing of wave due to the presence of dust grains. We have also compared the temporal irradiance of Gaussian and Sine beam in collisional plasma using dust kinetics including neutral atom ionizations, process of reunite the free electrons and ions, phenomena of adsorption on the surface of dust grains and photoemission from the dust grain surface, and binary collisions between dusty plasma constituents. The study of propagation of electromagnetic wave in non-thermal dusty plasma in exospheric environment considering diffusion limited escape theory, escape mechanism and dust dynamics made it a fascinating field of research for earth-satellite communication system and rocky planets. Modified dielectric permittivity, absorption co-efficient, and refractive index involving dust grains have also been examined. We have explored the threshold power of self-focusing of amplitude modulated laser beam in dusty plasma and self-trapping of Gaussian beam in complex plasma using dust charge, number density and energy balance of plasma constituents.