{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T13:01:09Z","timestamp":1790686869654,"version":"4.1.0"},"reference-count":14,"publisher":"AIP Publishing","issue":"9","funder":[{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","award":["DE-AC05-00OR22725"],"award-info":[{"award-number":["DE-AC05-00OR22725"]}],"id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","award":["DE-SC0022578"],"award-info":[{"award-number":["DE-SC0022578"]}],"id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:p>Accurate measurement of transient radiation power is critical for plasma diagnostics in magnetic confinement fusion, where rapid radiation events require high temporal resolution and reliable signal reconstruction. Fiber-optic bolometers (FOBs) based on silicon Fabry\u2013Perot interferometry are attractive alternatives to resistive bolometers because of their compact size, electromagnetic-interference immunity, remote sensing capability, and compatibility with high-temperature and high-vacuum environments. However, conventional FOB designs can exhibit slow and non-first-order thermal responses because of sensing-head thermal capacitance and distributed heat transport in the protruding silica fiber stub, often requiring deconvolution to recover transient radiation profiles. Here, we demonstrate a miniaturized FOB fabricated by femtosecond laser micromachining, featuring a \u223c20 \u03bcm-diameter silicon pillar and a \u223c150 \u03bcm-diameter gold absorber disk. The reduced absorber and pillar dimensions decrease sensing-head thermal capacitance, while a flush fiber\u2013copper-holder configuration eliminates the protruding fiber stub and suppresses distributed fiber thermal modes. Compared with previously reported FOBs, the device reduces the cooling time constant from \u223c200 to \u223c27.5\u00a0ms in vacuum while preserving a responsivity of \u223c7.8 mK\/(W\/m2) and a noise-equivalent power density of \u223c0.28 W\/m2. The thermal response is experimentally shown to be well approximated by a first-order lumped model, enabling direct reconstruction of incident power density using the bolometer equation. Square-wave and millisecond-scale Gaussian radiation transients reconstructed without deconvolution show close agreement with independently measured reference signals, demonstrating \u223c1\u00a0ms temporal resolution for real-time radiation diagnostics in fusion plasmas.<\/jats:p>","DOI":"10.1063\/5.0350044","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T12:36:55Z","timestamp":1790685415000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Miniaturized fiber-optic bolometer with reduced thermal time constant exhibiting first-order thermal dynamics"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-1875-6291","authenticated-orcid":false,"given":"Xiaoli","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering, Michigan State University 1 , East Lansing, Michigan 48824,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-2810-5335","authenticated-orcid":false,"given":"Babak","family":"Moeinimaleki","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Michigan State University 1 , East Lansing, Michigan 48824,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7595-4595","authenticated-orcid":false,"given":"Mohammed","family":"Alshammari","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Michigan State University 1 , East Lansing, Michigan 48824,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5039-3998","authenticated-orcid":false,"given":"Qiwen","family":"Sheng","sequence":"additional","affiliation":[{"name":"Nusenics 2 , 4942 Dawn Ave., East Lansing, Michigan 48823,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7761-1879","authenticated-orcid":false,"given":"Musaddeque","family":"Syed","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Michigan State University 1 , East Lansing, Michigan 48824,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7028-9004","authenticated-orcid":false,"given":"Seungsup","family":"Lee","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory 3 , Oak Ridge, Tennessee 37831,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-2066-2241","authenticated-orcid":false,"given":"Andrew","family":"Dvorak","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory 3 , Oak Ridge, Tennessee 37831,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9808-6305","authenticated-orcid":false,"given":"Morgan W.","family":"Shafer","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory 3 , Oak Ridge, Tennessee 37831,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3595-4560","authenticated-orcid":false,"given":"Ming","family":"Han","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Michigan State University 1 , East Lansing, Michigan 48824,","place":["USA"]},{"name":"Nusenics 2 , 4942 Dawn Ave., East Lansing, Michigan 48823,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,9,29]]},"reference":[{"issue":"9","key":"2026092908364461600_c1","doi-asserted-by":"publisher","first-page":"1549","DOI":"10.1088\/0741-3335\/45\/9\/302","article-title":"Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER","volume":"45","year":"2003","journal-title":"Plasma Phys. 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Des."}],"container-title":["Review of Scientific Instruments"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.aip.org\/aip\/rsi\/article-pdf\/doi\/10.1063\/5.0350044\/21154806\/093519_1_5.0350044.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.aip.org\/aip\/rsi\/article-pdf\/doi\/10.1063\/5.0350044\/21154806\/093519_1_5.0350044.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T12:36:55Z","timestamp":1790685415000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.aip.org\/rsi\/article\/97\/9\/093519\/3405499\/Miniaturized-fiber-optic-bolometer-with-reduced"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,1]]},"references-count":14,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2026,9,1]]}},"URL":"https:\/\/doi.org\/10.1063\/5.0350044","relation":{},"ISSN":["0034-6748","1089-7623"],"issn-type":[{"value":"0034-6748","type":"print"},{"value":"1089-7623","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2026,9]]},"published":{"date-parts":[[2026,9,1]]},"article-number":"093519"}}