AUTHOR=Shi Wenxuan , Yuan Bin , Mao Junfa 

TITLE=Controllable Enhancement of Evanescent and Transmitted Waves by a Plasma Sphere

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.890213

DOI=10.3389/fphy.2022.890213

ISSN=2296-424X

ABSTRACT=In this study, we present that the plasma sphere can focus and enhance the evanescent and transmitted wave. Electromagnetic waves propagating in plasma sphere with positive and negative permittivity, which lead to enhance transmitted and evanescent wave, are analyzed. The intensity of focus beam can be hundreds of times stronger than the incident wave. The enhancements effect is associated with plasma frequency, collision frequency and incident wave frequency. The results illustrate that the electromagnetic wave can be focused, reflected, and oscillated by controlling the electromagnetic parameters of the plasma sphere. With strong field enhancement available, it can be possible to use in microwave power amplifiers, plasma antenna, etc.