Ultrasensitive terahertz biosensor based on asymmetric metamaterial with a discontinuous dielectric layer

Xiaoran Wang; Weijian Cai; Youpeng Yang; Jianfang Zhu; Jingjing Zhao; Shuting Fan; Zhengfang Qian

doi:10.1117/12.3017490

15 December 2023 Ultrasensitive terahertz biosensor based on asymmetric metamaterial with a discontinuous dielectric layer

Xiaoran Wang, Weijian Cai, Youpeng Yang, Jianfang Zhu, Jingjing Zhao, Shuting Fan, Zhengfang Qian

Author Affiliations +

Proceedings Volume 12971, Third International Conference on Optics and Communication Technology (ICOCT 2023); 1297105 (2023) https://doi.org/10.1117/12.3017490
Event: Third International Conference on Optics and Communication Technology (ICOCT 2023), 2023, Changchun, China

Abstract

Terahertz (THz) waves are characterized by low photon energy, sensitivity to polar molecules, and different spectral responses to many biomolecules, which are of great research and application value in the biomedical field. Metamaterials are very sensitive to changes in the dielectric environment of their surfaces and have great potential in the field of sensing. Aiming at the current needs of terahertz-band biosensors whose sensitivity still needs to be improved, we propose an open-ring resonator biosensor with an asymmetric structure of discontinuous dielectric layers. Simulation results show that the refractive index sensitivity of this discontinuous dielectric layer metamaterial biosensor can reach up to 605 GHz/RIU, it exhibits a figure of merit (FOM) value of 24.2 RIU^-1 and a high quality (Q) factor of 79.8, indicating a high Q factor and an ultra-high sensitivity. These characteristics are significant in the design of terahertz ultra-sensitive biosensors, showcasing their valuable application potential.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Xiaoran Wang, Weijian Cai, Youpeng Yang, Jianfang Zhu, Jingjing Zhao, Shuting Fan, and Zhengfang Qian "Ultrasensitive terahertz biosensor based on asymmetric metamaterial with a discontinuous dielectric layer", Proc. SPIE 12971, Third International Conference on Optics and Communication Technology (ICOCT 2023), 1297105 (15 December 2023); https://doi.org/10.1117/12.3017490

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KEYWORDS

Biosensors

Terahertz metamaterials

Dielectrics

Metamaterials

Refractive index

Terahertz radiation

Electric fields

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