{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,22]],"date-time":"2026-02-22T08:14:26Z","timestamp":1771748066053,"version":"3.50.1"},"reference-count":35,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2019,7,22]],"date-time":"2019-07-22T00:00:00Z","timestamp":1563753600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Doctoral Program of Higher Education","award":["20130071130004"],"award-info":[{"award-number":["20130071130004"]}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11874122"],"award-info":[{"award-number":["11874122"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11474070"],"award-info":[{"award-number":["11474070"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61327008"],"award-info":[{"award-number":["61327008"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11074051"],"award-info":[{"award-number":["11074051"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We report on a novel optical microcavity sensing scheme by using the orthogonal demodulation Pound\u2013Drever\u2013Hall (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\u2013106, 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.<\/jats:p>","DOI":"10.3390\/s19143223","type":"journal-article","created":{"date-parts":[[2019,7,22]],"date-time":"2019-07-22T11:07:28Z","timestamp":1563793648000},"page":"3223","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Orthogonal Demodulation Pound\u2013Drever\u2013Hall Technique for Ultra-Low Detection Limit Pressure Sensing"],"prefix":"10.3390","volume":"19","author":[{"given":"Jinliang","family":"Hu","sequence":"first","affiliation":[{"name":"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"}]},{"given":"Sheng","family":"Liu","sequence":"additional","affiliation":[{"name":"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"}]},{"given":"Xiang","family":"Wu","sequence":"additional","affiliation":[{"name":"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"}]},{"given":"Liying","family":"Liu","sequence":"additional","affiliation":[{"name":"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"}]},{"given":"Lei","family":"Xu","sequence":"additional","affiliation":[{"name":"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"},{"name":"Department of Physics, Fudan University, Shanghai 200433, China"}]}],"member":"1968","published-online":{"date-parts":[[2019,7,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1007\/BF00702605","article-title":"Laser phase and frequency stabilization using an optical resonator","volume":"31","author":"Drever","year":"1983","journal-title":"Appl. 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