Nature and Role of Internal Field in Amplification and conductivity of Electromagnetic Wave

Abstract

Interaction of radiation plays an important role in determining the optical properties of matter. In this work amplification of electromagnetic waves depends on the relation between the external with internal field .It is shown that amplification exists when the external and internal field are in phase. When the two field are normal to each other no amplification exists . While absorption happens when the two fields apposes each other. The internally generated electric field due to the interaction of matter with electromagnetic field is usually described by polarization. An alternative way based on the notion of internal field and current density is introduced here. The mathematical model is based on RCL circuits and effective values and complex representations. It shows that the external field induces internal field perpendicular to it ,beside two current components ,One parallel and the other is perpendicular to it .The material act as a resister and an inductor connected in series.