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Orthogonal Demodulation Pound–Drever–Hall Technique for Ultra-Low Detection Limit Pressure Sensing

1
Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China
2
Department of Physics, Fudan University, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(14), 3223; https://doi.org/10.3390/s19143223
Received: 10 June 2019 / Revised: 15 July 2019 / Accepted: 20 July 2019 / Published: 22 July 2019
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Abstract

We report on a novel optical microcavity sensing scheme by using the orthogonal demodulation Pound–Drever–Hall (PDH) technique. We found that larger sensitivity in a broad range of cavity quality factor (Q) could be obtained. Taking microbubble resonator (MBR) pressure sensing as an example, a lower detection limit than the conventional wavelength shift detection method was achieved. When the MBR cavity Q is about 105–106, the technique can decrease the detection limit by one or two orders of magnitude. The pressure-frequency sensitivity is 11.6 GHz/bar at wavelength of 850 nm, and its detection limit can approach 0.0515 mbar. This technique can also be applied to other kinds of microcavity sensors to improve sensing performance. View Full-Text
Keywords: whispering-gallery mode (WGM) microcavity; micro-bubble resonator; Pound–Drever–Hall technique; pressure sensing whispering-gallery mode (WGM) microcavity; micro-bubble resonator; Pound–Drever–Hall technique; pressure sensing
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Hu, J.; Liu, S.; Wu, X.; Liu, L.; Xu, L. Orthogonal Demodulation Pound–Drever–Hall Technique for Ultra-Low Detection Limit Pressure Sensing. Sensors 2019, 19, 3223.

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