Dual-band refractive index sensor with cascaded asymmetric resonant compound grating based on bound states in the continuum

We propose a cascaded asymmetric resonant compound grating (ARCG) for high-performance dual-band refractive index sensing. The physical mechanism of the sensor is investigated using a combination of temporal coupled-mode theory (TCMT) and ARCG eigenfrequency information, which is verified by rigorou...

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Bibliographic Details
Published inOptics express Vol. 31; no. 9; pp. 13959 - 13969
Main Authors Liu, Xiuhong, Zhang, Chendong, Hu, Jinhua, Han, Haiyan
Format Journal Article
LanguageEnglish
Published United States 24.04.2023
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Summary:We propose a cascaded asymmetric resonant compound grating (ARCG) for high-performance dual-band refractive index sensing. The physical mechanism of the sensor is investigated using a combination of temporal coupled-mode theory (TCMT) and ARCG eigenfrequency information, which is verified by rigorous coupled-wave analysis (RCWA). The reflection spectra can be tailored by changing the key structural parameters. And by altering the grating strip spacing, a dual-band quasi-bound state in the continuum can be achieved. The simulation results show that the highest sensitivity of the dual-band sensor is 480.1 nm/RIU, and its figure of merit is 4.01 × 10 . The proposed ARCG has potential application prospects for high-performance integrated sensors.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.485867