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18 November 2019 Performance improvement of refractive index sensor based on two-dimensional metal-dielectric grating
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Abstract
In this paper, we propose a two-dimensional metal-dielectric grating with dielectric nanodisks on a thin gold film structure for refractive index sensing due to its near unity absorption at 1050 nm wavelength. The perfect absorption mainly originates from excitation of the horizontal magnetic dipole mode in the metal-dielectric structure. The results show that the sensitivity and full width half maximum are 560 nm/RIU and 11.13 nm over the sensing range of 1.33 to 1.38, respectively. Obviously, the corresponding figure of merit is calculated to be 50.3 RIU-1, which shows a high sensing performance. Moreover, it also shows excellent performance by measuring the light intensity change in the reflected light at a certain wavelength. The proposed structure has great potential application in biological sensing, integrated photodetectors, chemical applications and so on.
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Peng Sun, Changhe Zhou, Wei Jia, Jin Wang, Changcheng Xiang, Yongfang Xie, Dong Zhao, Ge Jin, Zonghao Ye, and Junjie Li "Performance improvement of refractive index sensor based on two-dimensional metal-dielectric grating", Proc. SPIE 11188, Holography, Diffractive Optics, and Applications IX, 111880Z (18 November 2019); https://doi.org/10.1117/12.2537752
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