中国物理B ›› 2015, Vol. 24 ›› Issue (9): 94102-094102.doi: 10.1088/1674-1056/24/9/094102

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

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

赵陶a b, 钟任斌a b, 胡旻a b, 陈晓行a b, 张平a b, 龚森a b, 刘盛纲a b   

  1. a Terahertz Research Center, School of Physical Electronics, University of Electronic Scienceand Technology of China, Chengdu 610054, China;
    b Cooperative Innovation Centre of Terahertz Science, Chengdu 610054, China
  • 收稿日期:2015-04-15 修回日期:2015-06-08 出版日期:2015-09-05 发布日期:2015-09-05
  • 基金资助:

    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), and the National High-tech Research and Development Project of China (Grant No. 2011AA010204).

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

Zhao Tao (赵陶)a b, Zhong Ren-Bin (钟任斌)a b, Hu Min (胡旻)a b, Chen Xiao-Xing (陈晓行)a b, Zhang Ping (张平)a b, Gong Sen (龚森)a b, Liu Sheng-Gang (刘盛纲)a b   

  1. a Terahertz Research Center, School of Physical Electronics, University of Electronic Scienceand Technology of China, Chengdu 610054, China;
    b Cooperative Innovation Centre of Terahertz Science, Chengdu 610054, China
  • Received:2015-04-15 Revised:2015-06-08 Online:2015-09-05 Published:2015-09-05
  • Contact: Zhong Ren-Bin E-mail:rbzhong@uestc.edu.cn
  • Supported by:

    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), and 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.

关键词: terahertz radiation, graphene surface plasmon polaritons, arbitrary profile grating, electron beam

Abstract:

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.

Key words: terahertz radiation, graphene surface plasmon polaritons, arbitrary profile grating, electron beam

中图分类号:  (Radiation by moving charges)

  • 41.60.-m
73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))