Impacts of Collision Frequency on Ability of Plasma to Absorb the Electromagnetic Wave

The electron collision frequency plays an important role in the interaction of the plasma and electromagnetic waves. In this paper, influences of electron collision frequencies of magnetized plasmas on their abilities to absorb electromagnetic waves are studied, with the model of single particle and considering the collective effect, respectively. Results show that, whether or not the collective effect is taken into account, to increase the electron collision frequencies will broaden the bandwidth of plasmas to absorb electromagnetic waves, but will reduce the absorbing peak value. Moreover, there is an optimal electron collision frequency making the absorption of the plasma to electromagnetic waves the strongest in a band. Finally, the optimal electron collision frequency of the non-magnetized plasma is presented.