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Chin. Phys. B, 2015, Vol. 24(9): 094102    DOI: 10.1088/1674-1056/24/9/094102
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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

Zhao Taoa b, Zhong Ren-Bina b, Hu Mina b, Chen Xiao-Xinga b, Zhang Pinga b, Gong Sena b, Liu Sheng-Ganga b
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
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.

Keywords:  terahertz radiation      graphene surface plasmon polaritons      arbitrary profile grating      electron beam     
Received:  15 April 2015      Published:  05 September 2015
PACS:  41.60.-m (Radiation by moving charges)  
  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
Fund: 

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).

Corresponding Authors:  Zhong Ren-Bin     E-mail:  rbzhong@uestc.edu.cn

Cite this article: 

Zhao Tao, Zhong Ren-Bin, Hu Min, Chen Xiao-Xing, Zhang Ping, Gong Sen, Liu Sheng-Gang Tunable terahertz radiation from arbitrary profile dielectric grating coated with graphene excited by an electron beam 2015 Chin. Phys. B 24 094102

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