Terahertz metasurface with multiple BICs/QBICs based on a split ring resonator

Zhang，Xingyuan1; Shi，Wenqiao1; Gu，Jianqiang1; Cong，Longqing2; Chen，Xieyu1; Wang，Kemeng1; Xu，Quan1; Han，Jiaguang1; Zhang，Weili3

2022-08-01

10.1364/OE.462247

OPTICS EXPRESS   Impact Factor & Quartile

1094-4087

1094-4087

Bound state in the continuum (BIC) refers to the trapped state in the radiation continuum of a system. In the terahertz band, BIC provides a unique and feasible method to design devices with ultra-high quality factor (Q factor) and to achieve intense terahertz-matter interaction, which is of great value to terahertz science and technology. Here, multiple BICs protected by the resonance symmetry in the terahertz metasurface consisting of metallic split ring resonators (SRR) is demonstrated. The evolution from the BIC to the quasi-BIC (QBIC) is induced by changing the gap width of the SRRs. The proposed BICs are experimentally demonstrated and analyzed by the coupled mode theory along with the numerical simulation. It is found that the leakage behavior of these QBICs is strongly affected by the intrinsic Ohmic loss in the SRRs while it is quite robust to the tilted incidence.

SCI ; EI

English

Others

China Postdoctoral Science Foundation[2020TQ0224];National Natural Science Foundation of China[61935015];National Natural Science Foundation of China[61975143];National Natural Science Foundation of China[62005193];National Natural Science Foundation of China[62027820];

Optics

Optics

WOS:000836698500069

Optica Publishing Group

20223112464713

Q factor measurement ; Ring gages ; Terahertz waves

Electromagnetic Waves:711 ; Optical Devices and Systems:741.3 ; Electric Variables Measurements:942.2 ; Special Purpose Instruments:943.3

PHYSICS

2-s2.0-85135056061

Scopus

1.Center for Terahertz Waves,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin,300072,China
2.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.School of Electrical and Computer Engineering Oklahoma State University,Stillwater,74078,United States

Zhang，Xingyuan,Shi，Wenqiao,Gu，Jianqiang,et al. Terahertz metasurface with multiple BICs/QBICs based on a split ring resonator[J]. OPTICS EXPRESS,2022,30(16):29088-29098.

Zhang，Xingyuan.,Shi，Wenqiao.,Gu，Jianqiang.,Cong，Longqing.,Chen，Xieyu.,...&Zhang，Weili.(2022).Terahertz metasurface with multiple BICs/QBICs based on a split ring resonator.OPTICS EXPRESS,30(16),29088-29098.

Zhang，Xingyuan,et al."Terahertz metasurface with multiple BICs/QBICs based on a split ring resonator".OPTICS EXPRESS 30.16(2022):29088-29098.