On transillumination of wave barriers for electromagnetic radiation in an inhomogeneous plasma

摘要

The interaction of electromagnetic waves with inhomogeneous and nonstationary media has been studied on the basis of exactly solvable models [1–4]. Such problems are interesting for a number of applications (e.g., for elevating the efficiency of electromagnetic radiation absorption during plasma heating, for explaining the mechanism of propagation of radiation from sources located in dense plasmas in astrophysics, and also for optimizing structures to elevate the effectiveness of nonreflection and absorbing coating layers in the radio-wave range and the development of thin streamlined radio-transparent antenna coverings (radomes). This is also important in the search for the optimal permittivity distribution over the thickness of the antireflection layer, which would ensure the minimum reflectance or transmission of electromagnetic signals from antennas covered by a dense plasma layer [5]. Earlier investigations (see, for example, [2, 3]) showed that nonreflection transmission of electromagnetic waves from a vacuum to the cover can be ensured in spite of a permittivity jump at the interface. In addition, these studies make it possible to improve considerably the understanding of electromagnetic field dynamics in space–time dielectric structures.