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

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 pro...

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Bibliographic Details
Published in:Chinese physics B 2015-09, Vol.24 (9), p.208-214
Main Author: 赵陶 钟任斌 胡旻 陈晓行 张平 龚森 刘盛纲
Format: Article
Language:English
Subjects:
Asymmetry
Dielectrics
Diffraction gratings
Dispersions
Excitation
Graphene
Miniature
Plasmons
介电
介质光栅
任意形状
可调谐
太赫兹辐射
电子束激发
表面等离子体激元
辐射特性
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Summary: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.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/9/094102