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Despite continuous advances in photonic applications, real\u2010time monitoring of nanoscale wetting transitions across nanostructures with 10\u2010nm gaps, the distance at which photonic performance is maximized, remains a chronic hurdle when attempting to quantify the water influx and molecules therein. For this reason, the present study develops a photonic switch that transforms the wetting transition into perceivable color changes using a liquid\u2010permeable Fabry\u2013Perot resonator. Electro\u2010capillary\u2010induced Cassie\u2010to\u2010Wenzel transitions produce an optical memory effect in the photonic switch, as confirmed by surface\u2010energy analysis, simulations, and an experimental demonstration. The results show that controlling the wetting behavior using the proposed photonic switch is a promising strategy for the integration of aqueous media with photonic hotspots in plasmonic nanostructures such as biochemical sensors.<\/jats:p>","DOI":"10.1002\/smll.202107060","type":"journal-article","created":{"date-parts":[[2022,2,21]],"date-time":"2022-02-21T06:55:47Z","timestamp":1645426547000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Development of a Photonic Switch via Electro\u2010Capillarity\u2010Induced Water Penetration Across a 10\u2010nm Gap"],"prefix":"10.1002","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7833-7303","authenticated-orcid":false,"given":"Eui\u2010Sang","family":"Yu","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering Seoul National University  Seoul 08826 Republic of Korea"},{"name":"Brain Science Institute Korea Institute 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