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Distortion of an amplitude modulated electromagnetic signal with time-dependent dust charging

Published online by Cambridge University Press:  03 August 2011

AJAY GAHLOT ,
RITU WALIA ,
SURESH C. SHARMA  and
R. P. SHARMA
AJAY GAHLOT
Affiliation:
Maharaja Surajmal Institute of Technology, C-4, Janakpuri, New Delhi, India
RITU WALIA
Affiliation:
Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No.-1, Sector-22, Rohini, Delhi-110086, India (suresh123sharma@yahoo.com)
SURESH C. SHARMA
Affiliation:
Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No.-1, Sector-22, Rohini, Delhi-110086, India (suresh123sharma@yahoo.com)
R. P. SHARMA
Affiliation:
Center for energy studies, Indian Institute of Technology (IIT), Hauz Khas, New Delhi-110016, India
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Abstract

A large amplitude modulated Gaussian electromagnetic beam propagating in a dusty plasma with dust charge fluctuations has been studied. The electrons are heated non-uniformly by the electromagnetic beam. For non-steady state, we obtain nonlinear current density in the presence of dust grains. This expression has been used to study the non-stationary self-focusing and resulting self-distortion of the amplitude modulated electromagnetic beam. It has been observed that the dust charge fluctuation increases the self-focusing of electromagnetic beam. It is also found that the effect of dust charge fluctuations is significant on the modulation index.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Issue 1 , February 2012 , pp. 33 - 38
Copyright
Copyright © Cambridge University Press 2011

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