Transmissive refractive index sensor based on asymmetric butterfly-shaped split ring metasurface array

Li Zhu; Yuanli Wang

doi:10.1117/12.3034236

5 July 2024 Transmissive refractive index sensor based on asymmetric butterfly-shaped split ring metasurface array

Li Zhu, Yuanli Wang

Proceedings Volume 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024); 131831D (2024) https://doi.org/10.1117/12.3034236
Event: The 3rd International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 2024, Wuhan, China

Abstract

With the development of fabrication technologies of micro and nano structures, terahertz metasurfaces have led to the emergence of terahertz refractive index sensors with unique performances in the field of biomedicine. Particularly, terahertz refractive index sensors exhibit high sensitivity, high quality factor and low loss which play an important role in the research field of biosensors. In this paper, we propose an asymmetric butterfly-shaped split-ring metasurface array made of gold which are place on the SiO₂ substrate. According to the simulation results, two resonances with high Q-factor are generated in the transmission spectrum. Both resonances show high sensitivities when employed for refractive index sensing. According to the current and electric filed distributions, the two resonant dips in the asymmetric butter fly shaped array is due to the excitation of toroidal dipole and magnetic dipole respectively. A Q-factor of 7.35, S of 250 GHz/RIU and FOM of 2.5 RIU^-1 are obtained at 0.735 THz, and a Q factor of 16.7, S of 400 GHz/RIU and FOM of 6.67 RIU^-1 are obtained at 1.18 THz. The structure parameters are optimized to further enhance the performance of the sensor.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Li Zhu and Yuanli Wang "Transmissive refractive index sensor based on asymmetric butterfly-shaped split ring metasurface array", Proc. SPIE 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 131831D (5 July 2024); https://doi.org/10.1117/12.3034236

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KEYWORDS

Terahertz radiation

Refractive index

Sensors

Detector arrays

Gold

Magnetism

Millimeter wave sensors

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