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However, achieving uniform growth of luminescent materials within confined plasmonic hotspots remains challenging, as conventional surface deposition or infiltration approaches cannot fill nanocavities effectively. To resolve this, we present a vacuum\u2010assisted capillary infiltration (VACI) strategy for delivering precursor solutions into gold (Au) nanohole (NH) arrays, enabling in situ crystallization within plasmonic cavities. This work demonstrates selective bulk\u2010like cesium lead bromide (CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    ) growth inside NHs through precise infiltration and controlled crystallization. By integrating the capillary effect with vacuum pressure, this approach ensures uniform filling beyond conventional methods. The successful integration of CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    was confirmed through peel\u2010off techniques and structural\/chemical analyses. Electromagnetic simulations predict an average field enhancement of |\n                    <jats:italic>\n                      E\/E\n                      <jats:sub>0<\/jats:sub>\n                    <\/jats:italic>\n                    | \u22482.80 at 800\u00a0nm, consistent with an experimentally observed \u223c40\u2010fold increase in two\u2010photon absorption (TPA)\u2010induced green emission (\n                    <jats:italic>\u03bb<\/jats:italic>\n                    \u2248526\u00a0nm). Unlike prior TPA systems employing quantum dots, rare\u2010earth doped crystals, or organic chromophores, this approach integrates bulk\u2010like perovskite directly into plasmonic NH cavities. This establishes a general framework for material\u2010structure integration in plasmonics and nanophotonics, and a foundation for infrared photodetection, high\u2010resolution nonlinear imaging, and quantum light sources.\n                  <\/jats:p>","DOI":"10.1002\/adma.73835","type":"journal-article","created":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T12:07:31Z","timestamp":1783598851000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Selective Growth of Bulk\u2010Like Perovskite in Plasmonic Nanoholes for Enhanced Two\u2010Photon\u2010Excited Emission"],"prefix":"10.1002","volume":"38","author":[{"given":"Jung\u2010Jae","family":"Do","sequence":"first","affiliation":[{"name":"Department of Chemical Engineering and Materials Science University of Minnesota  Minneapolis Minnesota USA"},{"name":"Department of Electrical and Computer Engineering University of Minnesota  Minneapolis Minnesota 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USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nathan C.","family":"Lindquist","sequence":"additional","affiliation":[{"name":"Department of Physics and Engineering Bethel University  St Paul Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2473-0222","authenticated-orcid":false,"given":"Jae Woong","family":"Jung","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering College of Engineering Kyung Hee University  Yongin\u2010si Gyeonggi\u2010do Republic of Korea"},{"name":"Integrated Education Institute for Frontier Materials (BK21 Four) Kyung Hee University  Yongin\u2010si Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7940-0490","authenticated-orcid":false,"given":"Bharat","family":"Jalan","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering and 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