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Title: Ultra-Low-Loss High-Contrast Gratings Based Spoof Surface Plasmonic Waveguide
Authors: Liu, Liangliang
Li, Zhuo
Xu, Bingzheng
Gu, Changqing
Chen, Xinlei
Sun, Hengyi
Zhou, Yongjin
Qing, Quan
Shum, Ping
Luo, Yu
Keywords: Experimental Realization
High-contrast Gratings (HCGs)
Issue Date: 2017
Source: Liu, L., Li, Z., Xu, B., Gu, C., Chen, X., Sun, H., et al. (2017). Ultra-Low-Loss High-Contrast Gratings Based Spoof Surface Plasmonic Waveguide. IEEE Transactions on Microwave Theory and Techniques, 65(6), 2008-2018.
Series/Report no.: IEEE Transactions on Microwave Theory and Techniques
Abstract: Large metallic losses and short propagation lengths associated with surface plasmons (SPs) have long been considered as the obstacles which severely limit the practical applications of surface plasmonic waveguides. In this paper, we introduce the concept of dielectric spoof SPs (SSPs) and show that subwavelength high-contrast gratings (HCGs) offer a route to effectively suppress the losses and hence dramatically increase the propagation length of surface electromagnetic waves. We experimentally realized a wideband ultra-low-loss high-confinement plasmonic waveguide constructed by a high refractive-index dielectric array with deep-subwavelength periodicity on a metal substrate. Simulation and measurement results on the near-field distributions and S-parameters at microwave frequencies provide explicit evidences of strong field localization and show excellent transmission efficiency of HCGs-based SSPs across a broad frequency band. More importantly, the propagation length of the HCGs-based SSPs is proved to be at least more than one order of magnitude larger than that of metallic gratings-based SSPs at the same or even higher level of field confinement. Thus, the SSPs as experimentally realized in this paper hold great promise for numerous practical applications in ultra-low-loss and long-range transmission SP devices and circuits and may open up new vistas in SP optics.
ISSN: 0018-9480
DOI: 10.1109/TMTT.2017.2662235
Rights: © 2017 IEEE.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles

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