Spoof plasmonic waveguide of a roofed metallic grating for terahertz applications

Yong-Qiang Liu, Liangsheng Li, Hongcheng Yin
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Abstract

Plasmonics has become a flourishing research field from optic to lower terahertz (THz) and microwave frequency band. The extreme intense near field of spoof surface plasmons (SSP) on the corrugated metal surface makes it attractive to develop novel electronic sources and many other compact devices in THz regime. In this paper, we propose and investigate a new spoof plasmonic waveguide composed of roofed metallic grating both theoretically and numerically. The theoretical result is verified by numerical simulation of finite integration method both for 2-D and 3-D structure and good agreement is realized. Dispersion and propagation losses of SSP mode on this structure with various structures are also studied and analyzed at THz frequencies (the real copper is used). We find that the roofed metal plate can make profound influence on SSP dispersion characteristics and propagation losses compared with that of opened structure thus should be considered carefully for practical applications. Decreasing the location of top metal plate can induce larger propagation losses of bound SSP mode. Other parameters are similar with that of opened grating which are also considered in the presence of roofed metallic plate. Our complete studies of this roofed metallic grating pave the way for a variety of potential applications such as low-loss waveguide, compact filters, high-efficiency antenna and efficient electronic sources in THz regime.
用于太赫兹应用的带顶金属光栅的欺骗等离子波导
等离子体动力学已成为一个蓬勃发展的研究领域,从光学到低太赫兹(THz)和微波频段。波形金属表面欺骗表面等离子体激元(SSP)的极强近场使其成为开发新型电子源和许多其他紧凑器件的热点。本文从理论上和数值上研究了一种由带顶板的金属光栅组成的新型欺骗等离子体波导。用有限积分法对二维和三维结构进行了数值模拟,验证了理论结果,得到了较好的一致性。在太赫兹频率下(使用真铜),研究和分析了该结构在不同结构下的SSP模式的色散和传播损耗。研究发现,与开放式结构相比,带顶金属板对SSP频散特性和传播损耗有较大影响,在实际应用中应慎重考虑。减小顶板的位置会导致束缚SSP模式的传播损耗增大。其他参数与开放光栅相似,也考虑了有顶金属板的存在。我们对这种屋顶金属光栅的完整研究为各种潜在应用铺平了道路,例如低损耗波导,紧凑滤波器,高效天线和太赫兹区域的高效电子源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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