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Surface 2D polariton waves manifest through a large concentration of electromagnetic field in the vertical direction, normal to their propagation. By confining vdWH materials into 2D photonic shapes, one can manipulate and compress light in lateral directions. Scattering\u2010type scanning near\u2010field optical microscopy is a perfect tool for direct imaging of the propagating polaritons and studying the properties of confined polaritons in nanostructures. Though, thus far, the quantitative analysis, such as the wavelength extraction, has been challenged for confined polaritons by incapability of mapping of the wave period on a sub\u2010wavelength scale and the difficulty of identifying an adequate substrate's \u201cbackground\u201d to subtract. Here, an analytical approach is developed to reveal the local propagation constant of confined polaritons under the above\u2010mentioned constraints and map it with sub\u2010wavelength resolution. Applied to the analysis of the SiC\/2D\u2010Ag\/EG (epitaxial graphene) photonic nanostructures, the technique uncovered that the polaritons are highly confined in both vertical (\u223c\n                    <jats:italic>\u03bb<\/jats:italic>\n                    \/50) and lateral directions (\u223c\n                    <jats:italic>\u03bb<\/jats:italic>\n                    \/40) by 2D metal.\n                  <\/jats:p>","DOI":"10.1002\/adma.202521015","type":"journal-article","created":{"date-parts":[[2026,5,26]],"date-time":"2026-05-26T07:26:09Z","timestamp":1779780369000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ultra\u2010Confinement of Polaritons in Single Atomic Layer Ag Photonic Quantum Dots"],"prefix":"10.1002","volume":"38","author":[{"given":"Xinyi","family":"Li","sequence":"first","affiliation":[{"name":"Department of Engineering Science and Mechanics The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3859-6367","authenticated-orcid":false,"given":"Tetyana","family":"Ignatova","sequence":"additional","affiliation":[{"name":"Department of Nanoscience Joint School of Nanoscience and Nanoengineering The University of North Carolina at Greensboro  Greensboro North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengye","family":"Dong","sequence":"additional","affiliation":[{"name":"Two\u2010Dimensional Crystal Consortium The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krishnan Mekkanamkulam","family":"Ananthanarayanan","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rinu Abraham","family":"Maniyara","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arpit","family":"Jain","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Furkan","family":"Turker","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vinay","family":"Kammarchedu","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aida","family":"Ebrahimi","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Electrical Engineering The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Biomedical Engineering The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua A.","family":"Robinson","sequence":"additional","affiliation":[{"name":"Two\u2010Dimensional Crystal Consortium The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Materials Science and Engineering The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Chemistry The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Physics The Pennsylvania State University  University Park Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7221-1091","authenticated-orcid":false,"given":"Slava V.","family":"Rotkin","sequence":"additional","affiliation":[{"name":"Department of Engineering Science and Mechanics The Pennsylvania State University  University Park Pennsylvania USA"},{"name":"Department of Physics The Pennsylvania State University  University Park Pennsylvania 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