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The films are characterized by the formation of Ag nanoparticles embedded in the Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> matrix, after thermal treatment at 600\u00a0\u00b0C, which are responsible for the appearance of an outstanding pronounced and narrow localized surface plasmon resonance (LSPR) band. Electron microscopy analysis also revealed the presence of larger Ag fractal aggregates at the film\u2019s surface, responsible for a broad band absorption. Noteworthily, the LSPR band maximum remains at the same position (about 412\u00a0nm) for Ag concentrations ranging from 23 to 34 at.%, despite some discernible alterations in both LSPR band intensity and width. An optimized thin film is characterized by full transparency in non-resonant wavelengths due to suppression of Ag aggregates at the film\u2019s surface, while maintaining the LSPR behavior. To better explain the plasmonic behavior of the Ag\/Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> films, discrete dipole approximation was used to determine the extinction, scattering, and absorption efficiencies of Ag spheres surrounded by an Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> cap layer. This allowed to ascertain some nanostructural features of the films, pointing to the formation of Ag nanoparticles with average sizes in the order of 40\u00a0nm.<\/jats:p>","DOI":"10.1007\/s11468-024-02227-2","type":"journal-article","created":{"date-parts":[[2024,2,19]],"date-time":"2024-02-19T15:02:56Z","timestamp":1708354976000},"page":"3177-3188","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Experimental and Theoretical Studies on Ag Nanoparticles with Enhanced Plasmonic Response, Formed Within Al2O3 Thin Films Deposited by Magnetron Sputtering"],"prefix":"10.1007","volume":"19","author":[{"given":"Houssem Eddine","family":"Sekrafi","sequence":"first","affiliation":[]},{"given":"Daniela S.","family":"Costa","sequence":"additional","affiliation":[]},{"given":"Manuela","family":"Proen\u00e7a","sequence":"additional","affiliation":[]},{"given":"Diana I.","family":"Meira","sequence":"additional","affiliation":[]},{"given":"Filipe","family":"Vaz","sequence":"additional","affiliation":[]},{"given":"Joel","family":"Borges","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,2,19]]},"reference":[{"key":"2227_CR1","doi-asserted-by":"publisher","first-page":"39","DOI":"10.1063\/1.3554315","volume":"64","author":"MI Stockman","year":"2011","unstructured":"Stockman MI (2011) Nanoplasmonics: the physics behind the applications. 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