{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T23:22:37Z","timestamp":1768346557408,"version":"3.49.0"},"reference-count":58,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,4,15]],"date-time":"2021-04-15T00:00:00Z","timestamp":1618444800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100007939","name":"Rangsit University","doi-asserted-by":"publisher","award":["85\/2562"],"award-info":[{"award-number":["85\/2562"]}],"id":[{"id":"10.13039\/501100007939","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, we propose a theoretical framework to explain how the transparent elastic grating structure can be employed to enhance the mechanical and optical properties for ultrasonic detection. Incident ultrasonic waves can compress the flexible material, where the change in thickness of the elastic film can be measured through an optical interferometer. Herein, the polydimethylsiloxane (PDMS) was employed in the design of a thin film grating pattern. The PDMS grating with the grating period shorter than the ultrasound wavelength allowed the ultrasound to be coupled into surface acoustic wave (SAW) mode. The grating gaps provided spaces for the PDMS grating to be compressed when the ultrasound illuminated on it. This grating pattern can provide an embedded thin film based optical interferometer through Fabry\u2013Perot resonant modes. Several optical thin film-based technologies for ultrasonic detection were compared. The proposed elastic grating gave rise to higher sensitivity to ultrasonic detection than a surface plasmon resonance-based sensor, a uniform PDMS thin film, a PDMS sensor with shearing interference, and a conventional Fabry\u2013Perot-based sensor. The PDMS grating achieved the enhancement of sensitivity up to 1.3 \u00d7 10\u22125 Pa\u22121 and figure of merit of 1.4 \u00d7 10\u22125 Pa\u22121 which were higher than those of conventional Fabry\u2013Perot structure by 7 times and 4 times, respectively.<\/jats:p>","DOI":"10.3390\/s21082787","type":"journal-article","created":{"date-parts":[[2021,4,15]],"date-time":"2021-04-15T21:35:13Z","timestamp":1618522513000},"page":"2787","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Analysis of Embedded Optical Interferometry in Transparent Elastic Grating for Optical Detection of Ultrasonic Waves"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4057-7237","authenticated-orcid":false,"given":"Chayanisa","family":"Sukkasem","sequence":"first","affiliation":[{"name":"College of Biomedical Engineering, Rangsit University, Pathum Thani 12000, Thailand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1459-8133","authenticated-orcid":false,"given":"Suvicha","family":"Sasivimolkul","sequence":"additional","affiliation":[{"name":"College of Biomedical Engineering, Rangsit University, Pathum Thani 12000, Thailand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8195-1841","authenticated-orcid":false,"given":"Phitsini","family":"Suvarnaphaet","sequence":"additional","affiliation":[{"name":"College of Biomedical Engineering, Rangsit University, Pathum Thani 12000, Thailand"}]},{"given":"Suejit","family":"Pechprasarn","sequence":"additional","affiliation":[{"name":"College of Biomedical Engineering, Rangsit University, Pathum Thani 12000, Thailand"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"168","DOI":"10.5455\/aim.2011.19.168-171","article-title":"Application of Ultrasound in Medicine","volume":"19","author":"Carovac","year":"2011","journal-title":"Acta Inform. 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