Amplitude modulation and demodulation of an electromagnetic wave in magnetised acousto-optic diffusive semiconductor plasmas: Hot carrier effects

In communication processes, amplitude modulation is very helpful to save power using a single band transmission. Using the hydrodynamical model of semiconductor plasma analytical investigations are made for the amplitude modulation as well as demodulation of an electromagnetic wave incorporating carrier heating (CH) effects in acousto-optic magnetised semiconductor plasma. The CH effects add new dimensions in the present analysis. Analysis are made under different wave number regions over a wide range of cyclotron frequencies. It is found that incorporation of CH effects modifies the amplitude modulation and demodulation processes effectively. Numerical estimations are made for III–V semiconductor crystal irradiated by pump wave of frequency 1.6×1013 s−1. Complete absorption of the waves takes place in all the possible wavelength regimes when the cyclotron frequency ωc becomes nearly equal to ω0, the pump frequency on neglecting the collision term in modulation/ demodulation indices.

► Amplitude modulation and demodulation of EM waves are studied. ► Hot carrier effects modify modulation processes effectively. ► Modulation index maximises when cyclotron frequency approaches pump frequency.