Sensitivity dependence of single nanoparticle mass detection based on mechanical oscillations in optical microcavities

Yuting He; Yanyan Zhi; Jiancong Li; Xiao-Chong Yu; Jie Li; Bai-Ou Guan

doi:10.1117/12.2642040

19 December 2022 Sensitivity dependence of single nanoparticle mass detection based on mechanical oscillations in optical microcavities

Yuting He, Yanyan Zhi, Jiancong Li, Xiao-Chong Yu, Jie Li, Bai-Ou Guan

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Proceedings Volume 12321, Advanced Sensor Systems and Applications XII; 123210B (2022) https://doi.org/10.1117/12.2642040
Event: SPIE/COS Photonics Asia, 2022, Online Only

Abstract

Single nanoparticle detection is demanding in fields such as early-stage diagnostics, environmental monitoring, and biochemical research. Optical whispering-gallery microcavities have high quality factors (Q factors) and small mode volumes, and mechanical oscillations can thus be excited by the strongly confined optical mode field. The mechanical mode frequency varies when the analyte attaches to the microcavity, and thus acts as an excellent sensing signal for single nanoparticle mass detection. In this work, we demonstrated the mass sensitivity dependence of mechanical modes on different cavity modes, the sensing sites, and the microcavity geometries, providing a way for optimizing the detection limit when designing a microcavity sensor.

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Yuting He, Yanyan Zhi, Jiancong Li, Xiao-Chong Yu, Jie Li, and Bai-Ou Guan "Sensitivity dependence of single nanoparticle mass detection based on mechanical oscillations in optical microcavities", Proc. SPIE 12321, Advanced Sensor Systems and Applications XII, 123210B (19 December 2022); https://doi.org/10.1117/12.2642040

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KEYWORDS

Optical microcavities

Nanoparticles

Mechanical sensors

Absorption

Analytical research

Diagnostics

Environmental monitoring

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