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Up to now, intrinsic and extrinsic Fabry-P\u00e9rot cavity sensors have been considered with analytes either being placed inside the resonator or coupled to evanescent fields on the outside. Here we demonstrate that Fabry-P\u00e9rot cavities can also be used to monitor molecule concentrations non-invasively and remotely, since the reflection of light from the target molecules back into the Fabry-P\u00e9rot cavity adds upwards peaks to the minima of its overall reflection rate. Detecting the amplitude of these peaks reveals information about molecule concentrations. By using an array of optical cavities, a wide range of frequencies can be probed at once and a unique optical fingerprint can be obtained.<\/jats:p>","DOI":"10.3390\/s23010385","type":"journal-article","created":{"date-parts":[[2022,12,30]],"date-time":"2022-12-30T03:19:46Z","timestamp":1672370386000},"page":"385","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Remote Non-Invasive Fabry-P\u00e9rot Cavity Spectroscopy for Label-Free Sensing"],"prefix":"10.3390","volume":"23","author":[{"given":"Abeer","family":"Al Ghamdi","sequence":"first","affiliation":[{"name":"School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK"},{"name":"School of Physics and Astronomy, King Saud University, Riyadh 11362, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Benjamin","family":"Dawson","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK"},{"name":"School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9856-6755","authenticated-orcid":false,"given":"Gin","family":"Jose","sequence":"additional","affiliation":[{"name":"School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7230-4220","authenticated-orcid":false,"given":"Almut","family":"Beige","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,29]]},"reference":[{"key":"ref_1","unstructured":"Malhotra, B.D., and Ali, M.A. (2017). 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