Mr. Xunong Zhang Profile

Xunong Zhang

at Huazhong Univ of Science and Technology

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Proceedings Article | 12 March 2021 Paper

Temperature sensor based on light scattering measurement of microcavity-coupled nanoparticles

Xunong Zhang, Jianjun Lai

Proceedings Volume 11763, 117630N (2021) https://doi.org/10.1117/12.2585863

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The principle of a new temperature sensor composed of a metal nanoparticle microcavity coupling system is proposed. The metallic nanoparticles can be used as an optical antenna to redirect the standing wave field in the Fabry–Perot(FP) microresonators to the far-field. The coupling mode of the microcavity greatly reduces the line width of the scattering spectrum, which is conducive to improving the spectral and temperature resolutions. When the polydimethylsiloxane (PDMS) film with a high thermo-optic coefficient is filled into the microcavity, the visible/near-infrared(NIR) scattering spectrum of the microcavity will drift as the ambient temperature changes. The calculation results show that when the cavity thickness of the microcavity is 2 μm, the temperature sensitivity of the sensor is -0.42 nm /°C.

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