Abstract

Highly sensitive terahertz (THz) sensing with metasurfaces has attracted considerable attention recently. However, ultrahigh sensing sensitivity remains a huge challenge for practical applications. To improve the sensitivity of these devices, herein we have proposed an out-of-plane metasurface-assisted THz sensor consisting of periodically arranged bar-like meta-atoms. Benefiting from elaborate out-of-plane structures, the proposed THz sensor with high sensing sensitivity of 325 GHz/RIU can be easily fabricated via a simple three-step fabrication process, and the maximum sensing sensitivity can be ascribed to toroidal dipole resonance-enhanced THz-matter interactions. The sensing ability of the fabricated sensor is experimentally characterized by the detection of three types of analytes. It is believed that the proposed THz sensor with ultrahigh sensing sensitivity and its fabrication method might provide great potential in emerging THz sensing applications.

© 2022 Optica Publishing Group

Near-unity circular dichroism enabled by toroidal dipole empowered bound states in the continuum for electrical switching and sensing

Yang Cheng, Junjie Li, Dongwen Zeng, Wei Liu, Zhengqi Liu, and Guiqiang Liu
Opt. Lett. 49(1) 165-168 (2024)

Ultrahigh-Q toroidal dipole resonance in all-dielectric metamaterials for terahertz sensing

Xu Chen and Wenhui Fan
Opt. Lett. 44(23) 5876-5879 (2019)

Toroidal dipole bound states in the continuum metasurfaces for terahertz nanofilm sensing

Xu Chen, Wenhui Fan, and Hui Yan
Opt. Express 28(11) 17102-17112 (2020)

Dual-toroidal dipole excitation on permittivity-asymmetric dielectric metasurfaces

Xingguang Liu, Junqing Li, Qiang Zhang, and Yixiao Wang
Opt. Lett. 45(10) 2826-2829 (2020)

Spatial Bessel-like beams along arbitrary convex trajectories based on a 3D-printed metasurface

Mei-jun Qu, Ren-wen Tian, Wen-yu Li, and Jian-xun Su
Opt. Lett. 47(14) 3507-3510 (2022)