Colloquium
Department of Physics, NCU
Electromagnetically induced transparency (EIT) in magnetized plasma
-A technology to make matter transparent-
Speaker
河森榮一郎教授(Prof. Eiichirou Kawamori)
Institute of Space and Plasma Sciences, National Cheng Kung University
Date 2016.05.17(Tue)
Time 14:00
Place S4-625
「歡迎大學部同學參加，可獲得中大護照認證2小時」
Abstract
This talk introduces a novel technology called electromagnetically induced transparency (EIT), that drastically alters optical property of matter such as absorption, reflection and emission. A magnetized plasma absorbing electron cyclotron waves is rendered transparent by EIT, which is a classical analog to the conventional EIT invoking quantum physics, while it is not a quantum mechanics-based phenomenon. Experimental studies on EIT in plasma have not been conducted since Harris first suggested a theoretical idea of plasma EIT in 1996 [1]. The first unequivocal experimental demonstration of the EIT in a magnetized plasma will be presented in this talk [2].
EIT in magnetized plasma [3,4] encompasses attractive potential applications. This talk shows a theoretical idea of electron lasing without momentum population inversion (ELWI) which is realized by magnetized plasma EIT. Numerical evidence that the ELWI mechanism works will be shown. The result indicates that emission and absorption of lights (waves) by the plasma-medium are unbalanced in the EIT-plasma states, that is, the absorption is absent although the emission takes place. This new concept of electron laser has a potential for establishing compact and high power electromagnetic wave sources
References
[1] S. E. Harris, Phys. Rev. Lett. 77, 5357 (1996).
[2] E. Kawamori, W. J. Syugu, T. Y. Hsieh, S.X. Song, C. Z. Cheng, Phys. Rev. Lett. 108, 075003 (2012).
[3] A. G. Litvak and M. D. Tokman, Phys. Rev. Lett. 88, 095003 (2002).
[4] G. Shvets, J. S. Wurtele, Phys. Rev. Lett. 89, 115003, (2002).