Generation of tunable electromagnetic radiation by a dust ripple in dusty plasmas |
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| Authors: | PK Shukla |
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| Institution: | a RUB International Chair, International Centre for Advanced Studies in Physical Sciences, Faculty of Physics & Astronomy, Ruhr University Bochum, 44780 Bochum, Germany
b Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92930, USA |
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| Abstract: | It is shown that a pre-existing dust ripple in a dusty plasma may excite tunable electromagnetic radiation. For our purposes, we use the Maxwell equation and the electron equation of motion to derive a Mathieu equation in the presence of a spatially oscillating dust ripple. The Mathieu equation admits instability of an electromagnetic wave. Criteria under which instability occurs are presented. Explicit expression for the electromagnetic radiation frequency and the growth rate are obtained. The possible relevance of our investigation to nonthermal electromagnetic radiation sources from laboratory and cosmic dusty plasmas is considered. |
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