{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T07:07:57Z","timestamp":1760425677674,"version":"build-2065373602"},"reference-count":35,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2019,1,18]],"date-time":"2019-01-18T00:00:00Z","timestamp":1547769600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002647","name":"Sungkyunkwan University","doi-asserted-by":"publisher","award":["Sungkyun Research Fund 2014"],"award-info":[{"award-number":["Sungkyun Research Fund 2014"]}],"id":[{"id":"10.13039\/501100002647","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We demonstrate a side-polished fiber-optic ultrasound sensor (SPFS) with a broad frequency bandwidth (dc\u201346 MHz at 6-dB reduction) and a wide amplitude detection range from several kPa to 4.8 MPa. It also exhibits a high acoustic sensitivity of 426 mV\/MPa with a signal-to-noise ratio of 35 dB and a noise-equivalent pressure of 6.6 kPa (over 1\u201350 MHz bandwidth) measured at 7-MHz frequency. The SPFS does not require multi-layer-coated structures that are used in other high-sensitivity optical detectors. Without any coating, this uses a microscale-roughened structure for evanescent-field interaction with an external medium acoustically modulated. Such unique structure allows significantly high sensitivity despite having a small detection area of only 0.016 mm2 as a narrow line sensor with a width of 8 \u03bcm. The SPFS performance is characterized in terms of acoustic frequency, amplitude responses, and sensitivities that are compared with those of a 1-mm diameter piezoelectric hydrophone used as a reference.<\/jats:p>","DOI":"10.3390\/s19020398","type":"journal-article","created":{"date-parts":[[2019,1,22]],"date-time":"2019-01-22T03:08:22Z","timestamp":1548126502000},"page":"398","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Side-Polished Fiber-Optic Line Sensor for High-Frequency Broadband Ultrasound Detection"],"prefix":"10.3390","volume":"19","author":[{"given":"Jeongmin","family":"Heo","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea"}]},{"given":"Kyu-Tae","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Physics, Inha University, Incheon 22212, Korea"}]},{"given":"Ryun Kyung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9295-6162","authenticated-orcid":false,"given":"Hyoung Won","family":"Baac","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2019,1,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"204103","DOI":"10.1063\/1.3589971","article-title":"High-sensitivity and wide-directivity ultrasound detection using high Q polymer microring resonators","volume":"98","author":"Ling","year":"2011","journal-title":"Appl. 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