Maraghechi P, Elezzabi A Y
Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada.
Opt Express. 2010 Dec 20;18(26):27336-45. doi: 10.1364/OE.18.027336.
We present a new class of plasmonic photoconductive THz emitters based on a complementary Sierpinski gasket fractal geometry. Due to the presence of sub-wavelength perforations on the surface of the antenna, these antennae operate in the plasmonic regime. By utilizing the unique self-similar and space filling of the tailored fractal surface and the plasmonic surface current spatial distribution, photoconductive THz emitters exhibiting superior performance (~80% increase in the emitted THz radiation power) to conventional bow-tie and Sierpinski gasket THz emitters are demonstrated. It is shown that the self-similarity of the surface plasmon current present on the antenna surface is responsible for this emission enhancement.
我们提出了一类基于互补谢尔宾斯基垫圈分形几何结构的新型等离子体光导太赫兹发射器。由于天线表面存在亚波长穿孔，这些天线在等离子体状态下工作。通过利用定制分形表面独特的自相似性和空间填充特性以及等离子体表面电流的空间分布，展示了与传统蝴蝶结和谢尔宾斯基垫圈太赫兹发射器相比具有卓越性能（发射的太赫兹辐射功率提高约80%）的光导太赫兹发射器。结果表明，天线表面存在的表面等离子体电流的自相似性是这种发射增强的原因。
