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Express"],"published-print":{"date-parts":[[2026,3,23]]},"abstract":"<jats:p>\n                    Acoustic sensors with high sensitivity and broadband response are essential for high-precision signal detection technology. In this paper, a high finesse membrane-free Fabry-P\u00e9rot (F-P) cavity structure is proposed based on a plano-concave resonator. By further enhancing the end-face reflectivity of the cavity, strong light confinement (Q-factor &gt; 10\n                    <jats:sup>6<\/jats:sup>\n                    ) is achieved. The membrane-free all-optical detector based on this structure exhibits a sensitivity increased by two orders of magnitude, with a minimum detectable pressure (MDP) of 0.3 mPa\/Hz\n                    <jats:sup>1\/2<\/jats:sup>\n                    @ 1k Hz. The flat response range was 1\u2005Hz-10 kHz with a sensitivity fluctuation of \u00b12\u2005dB. Moreover, the designed sensor has a compact size of 14\u2005mm\u00d7\u03a610\u2005mm. These excellent characteristics hold great potential for high-performance photoacoustic sensing technologies.\n                  <\/jats:p>","DOI":"10.1364\/oe.590803","type":"journal-article","created":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T14:00:21Z","timestamp":1773151221000},"page":"11593","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["High finesse membrane-free plano-concave optical detector for photoacoustic sensing"],"prefix":"10.1364","volume":"34","author":[{"given":"Jiajun","family":"Peng","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00p991c53","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Huazhong University of Science and Technology"},{"name":"Optics Valley Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenhui","family":"Xu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00p991c53","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Optics Valley Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Jiang","sequence":"additional","affiliation":[{"name":"State Grid Electric Power Research Institute"},{"name":"Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoning","family":"Song","sequence":"additional","affiliation":[{"name":"State Grid Zhejiang Electric Power Co., Ltd. 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