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
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
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
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.
中图分类号: (Radiation by moving charges)