High performance refractive index sensor based on multi-Fano resonances in waveguide coupled cross-shaped resonator

Zhuoyue Sun; Tonggang Zhao; Shilin Yu

doi:10.1117/12.2587247

12 March 2021 High performance refractive index sensor based on multi-Fano resonances in waveguide coupled cross-shaped resonator

Zhuoyue Sun, Tonggang Zhao, Shilin Yu

Author Affiliations +

Proceedings Volume 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications; 117635I (2021) https://doi.org/10.1117/12.2587247
Event: Seventh Symposium on Novel Photoelectronic Detection Technology and Application 2020, 2020, Kunming, China

Abstract

In this paper, a novel plasmonic structure consisting of a metal-insulator-metal (MIM) waveguide which is separated in intermediate region coupled with a cross-shaped cavity (CSC) is proposed. Based on the finite element method (FEM), results are simulated by COMSOL Multiphysics software concluding three different Fano resonances peaks and an independent Lorentz peak. Theoretically, multimode interference coupled mode theory (MICMT) is used to calculated the formation of the peaks. Besides, by changing the parameters of the structure, the influence of different parameters on each resonance peak is studied. Based on the original CSC structure, the system is extended to five types of Fano resonance system by appending a semi annular (SA) structure. The research results show that the sensitivity of expanded structure can be up to 1478 nm/RIU, and the FOM value can be as high as 5×10⁵, demonstrating its excellent nano-sensing performance and can be used as an efficient refractive index (RI) sensor.

Citation Download Citation

Zhuoyue Sun, Tonggang Zhao, and Shilin Yu "High performance refractive index sensor based on multi-Fano resonances in waveguide coupled cross-shaped resonator", Proc. SPIE 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications, 117635I (12 March 2021); https://doi.org/10.1117/12.2587247

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