{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T15:08:43Z","timestamp":1785424123400,"version":"3.56.0"},"reference-count":30,"publisher":"Optica Publishing Group","issue":"9","license":[{"start":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:00:00Z","timestamp":1773014400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:00:00Z","timestamp":1773014400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Appl. Opt."],"published-print":{"date-parts":[[2026,3,20]]},"abstract":"<jats:p>This study presents a temperature-tunable and photo-modulated sensing\n\t\t\t\t\tplatform based on a polyurethane\u2013azobenzene\u2013carbon black (PAC)\n\t\t\t\t\tcomposite that supports temperature-dependent narrow molecular\n\t\t\t\t\tabsorption features. PAC films fabricated under UV and visible light\n\t\t\t\t\tcuring exhibit distinct thermally responsive absorption features\n\t\t\t\t\tarising from strong light\u2013matter coupling within the composite. UV\n\t\t\t\t\tcuring promotes azobenzene trans\u2013cis isomerization and molecular\n\t\t\t\t\tasymmetry, leading to narrow, temperature-dependent absorption\n\t\t\t\t\tfeatures associated with azobenzene molecular transitions, whereas\n\t\t\t\t\tvisible curing yields broader, excitonic-dominated absorption\n\t\t\t\t\tprofiles. Micro-grating patterning induces anisotropic optical\n\t\t\t\t\tcoupling, resulting in polarization-dependent absorption enhancement\n\t\t\t\t\tand spectral modulation upon photo-exposure. Additionally, UV-cured\n\t\t\t\t\tgratings show amplified absorption under acetone vapor, attributed to\n\t\t\t\t\tphoto-induced polar site activation and enhanced gas\u2013polymer\n\t\t\t\t\tinteractions. Temporal coupled-mode theory (TCMT) analysis is used\n\t\t\t\t\tonly as a phenomenological fitting tool without implying physical mode\n\t\t\t\t\tconfinement. It provides only qualitative trends in\n\t\t\t\t\torientation-dependent changes. Altogether, the PAC platform\n\t\t\t\t\tsynergistically combines photothermal, photochromic, and structural\n\t\t\t\t\tanisotropies to deliver a reconfigurable, multifunctional optical\n\t\t\t\t\tsensing system responsive to temperature and gaseous environments.<\/jats:p>","DOI":"10.1364\/ao.590725","type":"journal-article","created":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T15:00:15Z","timestamp":1771340415000},"page":"2825","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Temperature-tunable anisotropic absorption for photo-modulated gas sensing"],"prefix":"10.1364","volume":"65","author":[{"given":"C.","family":"Parthiban","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/023c9pb11","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9101-9158","authenticated-orcid":true,"given":"Jayachandra","family":"Bingi","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/023c9pb11","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anudeep","family":"Vayyeti","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/023c9pb11","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sai Pavan Prashanth","family":"Sadhu","sequence":"additional","affiliation":[{"name":"Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Avinash","family":"Kumar","sequence":"additional","affiliation":[{"name":"Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,3,9]]},"reference":[{"key":"ao-65-9-2825-R1","doi-asserted-by":"publisher","first-page":"1040","DOI":"10.1002\/marc.200700041","type":"journal-article","volume":"28","author":"Bang","year":"2007","journal-title":"Macromol. 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All rights, including\n\t\t\t\t\tfor text and data mining (TDM), Artificial Intelligence (AI) training,\n\t\t\t\t\tand similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}