期刊
SENSORS
卷 20, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/s20082301
关键词
refractive index sensor; narrowband perfect absorber; epsilon-near-zero materials; metagrating
资金
- National Natural Science Foundation of China [51877015, 51377179, 61301120, 11611130023, 11403054, U1831117]
- Swedish Foundation for International Cooperation in Research and Higher Education [CH2015-6360]
- Fundamental Research Funds for the Central Universities [2019CDXYTX0023]
- Chongqing Natural Science Foundation [cstc2018jscx-msyb1002]
- Graduate Research and Innovation Foundation of Chongqing, China [CYS17039]
- China Scholarships Council [201706050024]
In this paper, a reconfigurable sensing platform based on an asymmetrical metal-insulator-metal stacked structure integrating an indium tin oxide (ITO) ultrathin film is proposed and investigated numerically. The epsilon-near-zero (ENZ) mode and antisymmetric mode can be resonantly excited, generating near-perfect absorption of over 99.7% at 1144 and 1404 nm, respectively. The absorptivity for the ENZ mode can be modulated from 90.2% to 98.0% by varying the ENZ wavelength of ITO by applying different voltages. To obtain a highly sensitive biosensor, we show that the proposed structure has a full-width at half-maximum (FWHM) of 8.65 nm and a figure-of-merit (FOM) of 24.7 with a sensitivity of 213.3 nm/RI (refractive index) for the glucose solution. Our proposed device has potential for developing tunable biosensors for real-time health monitoring.
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