{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T23:43:46Z","timestamp":1774309426743,"version":"3.50.1"},"reference-count":29,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2021,7,5]],"date-time":"2021-07-05T00:00:00Z","timestamp":1625443200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002241","name":"Japan Science and Technology Agency","doi-asserted-by":"publisher","award":["JPMJCR1904"],"award-info":[{"award-number":["JPMJCR1904"]}],"id":[{"id":"10.13039\/501100002241","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["20H02625"],"award-info":[{"award-number":["20H02625"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001700","name":"Ministry of Education, Culture, Sports, Science and Technology","doi-asserted-by":"publisher","award":["18H03889"],"award-info":[{"award-number":["18H03889"]}],"id":[{"id":"10.13039\/501100001700","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We demonstrate potential molecular monolayer detection using measurements of surface plasmon resonance (SPR) and angular Goos-H\u00e4nchen (GH) shift. Here, the molecular monolayer of interest is a benzenethiol self-assembled monolayer (BT-SAM) adsorbed on a gold (Au) substrate. Excitation of surface plasmons enhanced the GH shift which was dominated by angular GH shift because we focused the incident beam to a small beam waist making spatial GH shift negligible. For measurements in ambient, the presence of BT-SAM on a Au substrate induces hydrophobicity which decreases the likelihood of contamination on the surface allowing for molecular monolayer sensing. This is in contrast to the hydrophilic nature of a clean Au surface that is highly susceptible to contamination. Since our measurements were made in ambient, larger SPR angle than the expected value was measured due to the contamination in the Au substrate. In contrast, the SPR angle was smaller when BT-SAM coated the Au substrate due to the minimization of contaminants brought about by Au surface modification. Detection of the molecular monolayer acounts for the small change in the SPR angle from the expected value.<\/jats:p>","DOI":"10.3390\/s21134593","type":"journal-article","created":{"date-parts":[[2021,7,5]],"date-time":"2021-07-05T22:02:04Z","timestamp":1625522524000},"page":"4593","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-H\u00e4nchen Shift"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0239-6400","authenticated-orcid":false,"given":"Cherrie May","family":"Olaya","sequence":"first","affiliation":[{"name":"National Institute of Physics, University of the Philippines Diliman, Quezon City 1101, Philippines"},{"name":"Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, Wako 351-0198, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6656-9871","authenticated-orcid":false,"given":"Norihiko","family":"Hayazawa","sequence":"additional","affiliation":[{"name":"National Institute of Physics, University of the Philippines Diliman, Quezon City 1101, Philippines"},{"name":"Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, Wako 351-0198, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4775-5756","authenticated-orcid":false,"given":"Maria Vanessa","family":"Balois-Oguchi","sequence":"additional","affiliation":[{"name":"Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, Wako 351-0198, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6067-1170","authenticated-orcid":false,"given":"Nathaniel","family":"Hermosa","sequence":"additional","affiliation":[{"name":"National Institute of Physics, University of the Philippines Diliman, Quezon City 1101, Philippines"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5714-5401","authenticated-orcid":false,"given":"Takuo","family":"Tanaka","sequence":"additional","affiliation":[{"name":"National Institute of Physics, University of the Philippines Diliman, Quezon City 1101, Philippines"},{"name":"Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, Wako 351-0198, Japan"},{"name":"Metamaterials Laboratory, RIKEN Cluster for Pioneering Research, Wako 351-0198, Japan"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"014001","DOI":"10.1088\/2040-8978\/15\/1\/014001","article-title":"Goos\u2013H\u00e4nchen and Imbert\u2013Fedorov beam shifts: An overview","volume":"15","author":"Bliokh","year":"2013","journal-title":"J. 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