Tunable terahertz radiation from arbitrary profile dielectric grating coated with graphene excited by an electron beam  

作　　者：赵陶 钟任斌 胡旻 陈晓行 张平 龚森 刘盛纲 

机构地区：[1]Terahertz Research Center,School of Physical Electronics,University of Electronic Science and Technology of China [2]Cooperative Innovation Centre of Terahertz Science

出　　处：《Chinese Physics B》2015年第9期208-214,共7页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2014CB339801);the National Natural Science Foundation of China(Grant Nos.61231005,11305030,and 612111076);the Fundamental Research Funds for the Central Universities of China(Grant No.ZYGX2013J058);the National High-tech Research and Development Project of China(Grant No.2011AA010204)

摘　　要：In this paper, the enhanced terahertz radiation transformed from surface plasmon polaritons, excited by a uniformly moving electron bunch, in a structure consisting of a monolayer graphene supported on a dielectric grating with arbitrary profile is investigated. The results show that the grating profile has significant influence on the dispersion curves and radiation characteristics including radiation frequency and intensity. The dependence of dispersion and radiation characteristics on the grating shape for both the symmetric and asymmetric gratings is studied in detail. Moreover, we find that, for an asymmetric grating with certain profile, there exist two different diffraction types, and one of the two types can provide higher radiation intensity comparing to the other one. These results will definitely facilitate the practical application in developing a room-temperature, tunable, coherent and miniature terahertz radiation source.In this paper, the enhanced terahertz radiation transformed from surface plasmon polaritons, excited by a uniformly moving electron bunch, in a structure consisting of a monolayer graphene supported on a dielectric grating with arbitrary profile is investigated. The results show that the grating profile has significant influence on the dispersion curves and radiation characteristics including radiation frequency and intensity. The dependence of dispersion and radiation characteristics on the grating shape for both the symmetric and asymmetric gratings is studied in detail. Moreover, we find that, for an asymmetric grating with certain profile, there exist two different diffraction types, and one of the two types can provide higher radiation intensity comparing to the other one. These results will definitely facilitate the practical application in developing a room-temperature, tunable, coherent and miniature terahertz radiation source.

关 键 词：terahertz radiation graphene surface plasmon polaritons arbitrary profile grating electron beam 

分 类 号：O441.4[理学—电磁学]