中国物理B ›› 2017, Vol. 26 ›› Issue (7): 78401-078401.doi: 10.1088/1674-1056/26/7/078401

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Negative-index dispersion and accidental mode degeneracy inan asymmetric spoof–insulator–spoof waveguide

Li-li Tian(田莉莉), Jian-long Liu(刘建龙), Ke-ya Zhou(周可雅), Yang Gao(高扬), Shu-tian Liu(刘树田)   

  1. 1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
    2 College of Electronic Engineering, Heilongjiang University, Harbin 150080, China
  • 收稿日期:2017-01-16 修回日期:2017-04-04 出版日期:2017-07-05 发布日期:2017-07-05
  • 通讯作者: Shu-tian Liu E-mail:stliu@hit.edu.cn
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No.2013CBA01702) and the National Natural Science Foundation of China (Grant Nos.61377016,61575055,10974039,61307072,61308017,and 61405056).

Negative-index dispersion and accidental mode degeneracy inan asymmetric spoof–insulator–spoof waveguide

Li-li Tian(田莉莉)1, Jian-long Liu(刘建龙)1, Ke-ya Zhou(周可雅)1, Yang Gao(高扬)2, Shu-tian Liu(刘树田)1   

  1. 1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
    2 College of Electronic Engineering, Heilongjiang University, Harbin 150080, China
  • Received:2017-01-16 Revised:2017-04-04 Online:2017-07-05 Published:2017-07-05
  • Contact: Shu-tian Liu E-mail:stliu@hit.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No.2013CBA01702) and the National Natural Science Foundation of China (Grant Nos.61377016,61575055,10974039,61307072,61308017,and 61405056).

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摘要： It has been recently demonstrated that negative-index dispersion and mode degeneracy can be achieved by manipulating a spoof–insulator–spoof (SIS) waveguide. In this paper, we propose a new SIS waveguide, which is composed of two spoof surface plasmon polaritons (SSPPs) waveguides drilled with periodic rhomboidal grooves. Both the symmetric and asymmetric cases are investigated. Our simulation results show that the asymmetric SIS waveguides are more significant. By tailoring the tilt of the rhomboidal grooves, the negative-index dispersion can be achieved and the microwave band gap (MBG) can be effectively modulated. At a critical tilt, there appears an accidental mode degeneracy at the edge of the first Brillouin zone. The excitation and propagation of the two coupled modes sustained by the asymmetric SIS waveguides are also demonstrated.

关键词: spoof surface plasmon polaritons, waveguide, negative index, mode degeneracy

Abstract: It has been recently demonstrated that negative-index dispersion and mode degeneracy can be achieved by manipulating a spoof–insulator–spoof (SIS) waveguide. In this paper, we propose a new SIS waveguide, which is composed of two spoof surface plasmon polaritons (SSPPs) waveguides drilled with periodic rhomboidal grooves. Both the symmetric and asymmetric cases are investigated. Our simulation results show that the asymmetric SIS waveguides are more significant. By tailoring the tilt of the rhomboidal grooves, the negative-index dispersion can be achieved and the microwave band gap (MBG) can be effectively modulated. At a critical tilt, there appears an accidental mode degeneracy at the edge of the first Brillouin zone. The excitation and propagation of the two coupled modes sustained by the asymmetric SIS waveguides are also demonstrated.

Key words: spoof surface plasmon polaritons, waveguide, negative index, mode degeneracy

中图分类号:  (Waveguides, transmission lines, striplines)

  • 84.40.Az
84.40.Dc (Microwave circuits) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)