Terahertz topological photonic crystals with dual edge states for efficient routing

Xing, Hongyang; Xu, Guizhen; Lu, Dan; Fan, Junxing; Xue, Zhanqiang; Gao, Zhen; Cong, Longqing

2023-06-01

10.1364/OL.492336

OPTICS LETTERS   影响因子和分区

0146-9592

1539-4794

Topological photonic crystals with robust pseudo-spin and valley edge states have shown promising and wide appli-cations in topological waveguides, lasers, and antennas. However, the limited bandwidth and intrinsic coupling prop-erties of a single pseudo-spin or valley edge state have imposed restrictions on their multifunctional applications in integrated photonic circuits. Here, we propose a topologi-cal photonic crystal that can support pseudo-spin and valley edge states simultaneously in a single waveguiding channel, which effectively broadens the bandwidth and enables a mul-tipath routing solution for terahertz information processing and broadcasting. We show that distorted Kekule lattices can open two types of bandgaps with different topological properties simultaneously by molding the inter-and intra-unit cell coupling of the tight-binding model. The distinct topological origins of the edge states provide versatile signal routing paths toward free space radiation or on-chip self -localized edge modes by virtue of their intrinsic coupling properties. Such a powerful platform could function as an integrated photonic chip with capabilities of broadband on -chip signal processing and distributions that will especially benefit terahertz wireless communications. (c) 2023 Optica Publishing Group

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[62175099] ; Basic and Applied Basic Research Foundation of Guangdong Province[2023A1515011085] ; Stable Support Program for Higher Education Institutions from Shenzhen Science, Technology amp; Innovation Commission[20220815151149004]

Optics

Optics

WOS:001016510600009

Optica Publishing Group

20232614324562

Bandwidth ; Landforms ; Signal processing ; Topology ; Waveguides

Geology:481.1 ; Waveguides:714.3 ; Information Theory and Signal Processing:716.1 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4

PHYSICS

Web of Science

Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Xing, Hongyang,Xu, Guizhen,Lu, Dan,et al. Terahertz topological photonic crystals with dual edge states for efficient routing[J]. OPTICS LETTERS,2023,48(11):2805-2808.

Xing, Hongyang.,Xu, Guizhen.,Lu, Dan.,Fan, Junxing.,Xue, Zhanqiang.,...&Cong, Longqing.(2023).Terahertz topological photonic crystals with dual edge states for efficient routing.OPTICS LETTERS,48(11),2805-2808.

Xing, Hongyang,et al."Terahertz topological photonic crystals with dual edge states for efficient routing".OPTICS LETTERS 48.11(2023):2805-2808.