Abstract

In this work, spoof surface plasmon polaritons (SSPPs) supported by microstrip lines with $T$-shaped complementary grooves are proposed. Compared with the traditional SSPP structure based on single-conductor transmission lines, a broadband high-order mode of SSPPs can be predicted from the dispersion diagrams. Besides, a decrease in transverse size of 75% can be realized under the same asymptotic frequency. Then, a smooth and simple transition, which is composed of gradient complementary grooves, is designed to realize high-efficiency excitation and support practical applications of the high-order mode of SSPPs. As a result, a seamless connection with microstrip lines is easily achieved without using flaring ground, which simplifies the design procedure. Based on the proposed structure, a prototype of a SSPP waveguide is designed and fabricated. Both numerical and experimental results validate efficient excitation and broadband propagation (up to 12 GHz) of the high-order mode of SSPPs. This work will greatly accelerate the development of advanced plasmonic integrated circuits at microwave frequencies.

© 2018 Optical Society of America

High-efficiency broadband excitation and propagation of second-mode spoof surface plasmon polaritons by a complementary structure

Dawei Zhang, Kuang Zhang, Qun Wu, Guohui Yang, and Xuejun Sha
Opt. Lett. 42(14) 2766-2769 (2017)

Terahertz broadband spoof surface plasmon polaritons using high-order mode developed from ultra-compact split-ring grooves

Kai-Da Xu, Ying Jiang Guo, and Xianjin Deng
Opt. Express 27(4) 4354-4363 (2019)

Smooth bridge between guided waves and spoof surface plasmon polaritons

Liangliang Liu, Zhuo Li, Changqing Gu, Bingzheng Xu, Pingping Ning, Chen Chen, Jian Yan, Zhenyi Niu, and Yongjiu Zhao
Opt. Lett. 40(8) 1810-1813 (2015)

Splitting spoof surface plasmon polaritons to different directions with high efficiency in ultra-wideband frequencies

Jun Wang, Lei Zhao, Zhang-Cheng Hao, Xiaopeng Shen, and Tie Jun Cui
Opt. Lett. 44(13) 3374-3377 (2019)

High-efficient and low-coupling spoof surface plasmon polaritons enabled by V-shaped microstrips

Longfang Ye, Hao Feng, Guoxiong Cai, Yong Zhang, Bo Yan, and Qing Huo Liu
Opt. Express 27(16) 22088-22099 (2019)