{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T15:57:28Z","timestamp":1791475048623,"version":"4.3.4"},"reference-count":43,"publisher":"Wiley","issue":"56","license":[{"start":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T00:00:00Z","timestamp":1785974400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T00:00:00Z","timestamp":1785974400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["advanced.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Advanced Materials"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Nanoscale mechano\u2010optical surfaces enable electronics\u2010free strain sensing, attractive for skin\u2010interfaced devices, yet reported implementations require laser\/spectrometer interrogation, negating this advantage. Here, we report electrically passive mechanical transduction of arterial pulsation into diffractive colour shifts read by unmodified smartphone cameras, enabled by a dual\u2010function monolithic poly\u2010dimethylsiloxane (PDMS) film. Using large\u2010area double\u2010sided nanoimprinting, we achieve a strain\u2010sensitive nanophotonic surface on one face of the film and a bio\u2010inspired 3D structural adhesive on the other. We measure strain\u2010dependent optical response and reproduce it in color\u2010mixing optical simulations. In uniaxial cyclic loading tests, 2% strain produces a 9% RGB\u2010intensity modulation, stable over 1000 cycles. Further, 3D structuring improves adhesive shear strength by 65% on skin over flat PDMS. Hand\u2010held smartphone recordings in humans (\n                    <jats:italic>n<\/jats:italic>\n                    = 13) resolve sub\u2010beat hemodynamics in agreement with clinical reference (per\u2010beat waveform\n                    <jats:italic>\u03c1<\/jats:italic>\n                    = 0.94 \u00b1 0.03), exceeding established non\u2010invasive techniques such as active reflectance photoplethysmography (PPG), imaging PPG, and piezoelectric pulse\u2010force sensors in simultaneous recordings. Importantly, mechanical transduction at the elastomer\u2013air interface presents an optical cardiovascular monitoring approach agnostic to dermal\u2010melanin, a known PPG confounder. Together, these advances establish camera\u2010readable mechanochromic elastomers as versatile materials platforms for wearable cardiovascular monitoring, point\u2010of\u2010care diagnostics, and electronics\u2010free human\u2010machine interfaces.\n                  <\/jats:p>","DOI":"10.1002\/adma.74512","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T09:54:47Z","timestamp":1786010087000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Circuit\u2010Free Cardiovascular Monitoring via Smartphone\u2010Readable Skin\u2010Interfaced Nanophotonic Films"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8155-5857","authenticated-orcid":false,"given":"Torjus L.","family":"Steffensen","sequence":"first","affiliation":[{"name":"Department of Circulation and Medical Imaging Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vegar","family":"Stubberud","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emilie S.","family":"Hennisen","sequence":"additional","affiliation":[{"name":"Department of Electronic Systems Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eryk T.","family":"Winogrocki","sequence":"additional","affiliation":[{"name":"Department of Electronic Systems Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"L\u00f6vgren","sequence":"additional","affiliation":[{"name":"Department of Electronic Systems Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arthur G. S.","family":"Torvund","sequence":"additional","affiliation":[{"name":"Department of Electronic Systems Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H\u00e5vard","family":"Vestad","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nils K.","family":"Skj\u00e6rvold","sequence":"additional","affiliation":[{"name":"Department of Circulation and Medical Imaging Norwegian University of Science and Technology  Trondheim Norway"},{"name":"St. Olav's University Hospital  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8366-0201","authenticated-orcid":false,"given":"Martin","family":"Steinert","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8406-9571","authenticated-orcid":false,"given":"Angelos","family":"Xomalis","sequence":"additional","affiliation":[{"name":"Department of Electronic Systems Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,6]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41591\u2010020\u20100792\u20109"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.2196\/18636"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.3389\/fped.2024.1442753"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41569\u2010025\u201001127\u20100"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202110291"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44222\u2010023\u201000090\u20100"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41746-022-00734-2"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adj6613"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.nanolett.5c03172"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abk2593"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202419161"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3RA03050D"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202412322"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202418705"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bspc.2023.105608"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bja.2022.03.011"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361\u20106579\/acd51a"},{"key":"e_1_2_10_19_1","unstructured":"U. 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