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The operational range and spatial resolution are inherently limited by sensor sensitivity, in which conventional piezoelectric transducers have been overwhelmed by advanced photonic sensors. Here, we demonstrate an optomechanical ultrasonic sensor integrated into a photonic platform, which comprises a suspended SiO\n                    <jats:sub>2<\/jats:sub>\n                    membrane embedded with a high-\n                    <jats:italic>Q<\/jats:italic>\n                    Si\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    microring resonator. By exploiting simultaneous optical and mechanical resonances, the sensor achieves a record low noise-equivalent pressure (NEP) of 218\u2009nPa\u2009Hz\n                    <jats:sup>\u22121\/2<\/jats:sup>\n                    at 289\u2009kHz in air and 9.6\u2009nPa\u2009Hz\n                    <jats:sup>\u22121\/2<\/jats:sup>\n                    at 52\u2009kHz in water. We demonstrate its versatility through photoacoustic gas spectroscopy in air and underwater ultrasound imaging, achieving a minimum detectable C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    concentration of 2.9\u2009ppm (integration time 1\u2009s) and an imaging resolution of 1.89\u2009mm, respectively. Our work represents a significant advancement in compact CMOS-compatible ultrasound sensing, unlocking new possibilities in biomedical imaging, environmental monitoring, industrial testing, and underwater communications.\n                  <\/jats:p>","DOI":"10.1038\/s41377-026-02238-0","type":"journal-article","created":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T09:46:56Z","timestamp":1773654416000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Integrated optomechanical ultrasonic sensors with nano-Pascal-level sensitivity"],"prefix":"10.1038","volume":"15","author":[{"given":"Xuening","family":"Cao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhi-Gang","family":"Hu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zu-Lei","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanlei","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian-Fei","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-0410-3432","authenticated-orcid":false,"given":"Jincheng","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenghao","family":"Lao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7036-1712","authenticated-orcid":false,"given":"Qi-Fan","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bei-Bei","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,16]]},"reference":[{"key":"2238_CR1","doi-asserted-by":"publisher","first-page":"159","DOI":"10.1038\/s41377-024-01480-8","volume":"13","author":"XN Cao","year":"2024","unstructured":"Cao, X. 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