Modeling of transients in cylinder with time-varying plasma

The strong interest in the interaction between electromagnetic waves and plasmas is due to their wide range of potential applications. Tuning of resonant characteristics of microdisk resonators by free carrier plasma injections has a wide range of potential applications including active switchers or tunable filters. Transient phenomena in plasma lead to the frequency up-shifting possibility and the wave generation. Using resonators composed of negative permittivity materials such as plasma can form the basis of effective small antenna elements. Plasma is used in a light-modulated photo-induced method for the creation of a nonmechanical millimeter wave scanning technique. Therefore accurate time domain modeling for investigation of electromagnetic field with time-varying plasma is of great importance. In this paper we investigate the transformation of the incident wave due to change of plasma frequency in the cylinder. The main interest is in the transient response, evaluation of the transition time and the transformed diffraction pattern in the steady state regime.