Abstract

We proposed a quasi-bound states in the continuum (QBICs) metasurface to realize sensing in the terahertz band. It consists of silicon split ellipse cylinders with different short-long axes and a quartz substrate. By introducing two asymmetric split ellipse cylinders unit cells, magnetic dipole and electric quadrupole resonances of the proposed structure are investigated by multiple Pole theory. This shows that the continuum bound states are transformed into quasi-BICs by tuning the length of the ellipse long axis, and so a high-quality factor can be obtained. The Q value of the proposed structure is 3205, and the figure of merit is 469.64. It has potential applications in gas, liquid, and biomaterial sensing.

© 2023 Optica Publishing Group

Performance comparison of two terahertz all-dielectric metasurfaces based on bound states in the continuum

Ningning Yang, Tingting Lang, Wenyang Cen, Zhenyu Yu, Meiyu Xiao, Jinhui Zhang, and Yanqing Qiu
J. Opt. Soc. Am. B 40(2) 366-372 (2023)

Dirac semimetal and an all dielectric based tunable ultrasensitive terahertz sensor with multiple bound states in the continuum

Hang Liu, Kun Wang, Jingxiang Gao, Meng Liu, Huiyun Zhang, and Yuping Zhang
Opt. Express 30(26) 46471-46486 (2022)

Ultrasensitive tunable terahertz lithium niobate metasurface sensing based on bound states in the continuum

Xinyao Yu, Fanghao Li, Tingting Lang, Jianyuan Qin, and Xiao Ma
Photon. Res. 11(12) 2168-2178 (2023)

Anisotropic medium sensing controlled by bound states in the continuum in polarization-independent metasurfaces

Jing-Yi Gao, Jin Liu, Hai-Ma Yang, Hai-Shan Liu, Guohui Zeng, and Bo Huang
Opt. Express 31(26) 44703-44719 (2023)

Multiple bound states in the continuum based on the dielectric metasurface

Suxia Xie, Jingcheng Yang, Weiwei Shen, Chongjun Bai, Siyi Sun, and Xin Guan
J. Opt. Soc. Am. B 40(8) 2129-2138 (2023)