太赫兹辐射
表面等离子体激元
切伦科夫辐射
材料科学
等离子体子
石墨烯
光电子学
表面等离子体子
极化子
光学
等离子透镜
物理
纳米技术
探测器
作者
Tao Zhao,Min Hu,Renbin Zhong,Sen Gong,Chaofeng Zhang,Shenggang Liu
摘要
We demonstrate a mechanism of efficiently transforming surface plasmon polaritons (SPPs) into Cherenkov terahertz (THz) radiation. In a structure where multilayer graphene is deposited on a dielectric substrate with a buffer layer, the energy of the SPPs can be significantly enhanced. The dispersion of SPPs crosses the light line of the substrate if the buffer layer has a low permittivity relative to the substrate. As a result, the SPPs can be readily transformed into radiation without the need of wavevector compensation. Compared to the radiation from structures without graphene, the radiation power density is enhanced by nearly three orders of magnitude due to the field enhancement of SPPs. Our results could provide a promising way for developing room temperature, tunable, coherent, and intense THz radiation sources to cover the entire THz regime.
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