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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 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 College of Electronic Engineering, Heilongjiang University, Harbin 150080, China |
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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.
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Received: 16 January 2017
Revised: 04 April 2017
Accepted manuscript online:
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PACS:
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84.40.Az
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(Waveguides, transmission lines, striplines)
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84.40.Dc
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(Microwave circuits)
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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| Fund: 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). |
Corresponding Authors:
Shu-tian Liu
E-mail: stliu@hit.edu.cn
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Cite this article:
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) Negative-index dispersion and accidental mode degeneracy inan asymmetric spoof–insulator–spoof waveguide 2017 Chin. Phys. B 26 078401
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