Resonant reduction in microwave reflectivity from an overdense plasma with the employment of a parallel metal grating

Liu, C. S.; Tripathi, V. K.; Annou, R.
June 2008
Physics of Plasmas;Jun2008, Vol. 15 Issue 6, p062103
Academic Journal
A microwave normally incident on an overdense plasma is totally reflected. However, the presence of a thin metal grating parallel to the plasma surface greatly reduces the reflectivity when the grating wave number equals the wave number of the surface plasma wave on the plasma-free space interface at microwave frequency. The microwave induces an oscillatory current in the free electrons of the grating at the frequency of the microwave, ω, and wave number of the grating, q. This current resonantly excites a surface plasma wave (SPW) on the plasma surface. The diversion of microwave power into SPW severely reduces the microwave reflectivity.


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