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However, a fundamental trade\u2010off exists between deep sub\u2010wavelength field localization and its efficient coupling to free\u2010space light, limiting their practical performance. Here, we show that by balancing the electric and magnetic resonance, more than 55 % of a focused Gaussian beam can be fueled into a nanocube\u2010on\u2010mirror nanocavity. With few concentric gratings, the coupling efficiency can even go up to &gt;95 % at optimal conditions. This design can work at both visible and telecommunication wavelengths and show robust tolerance to fabrication imperfections. Our work indicates that the long\u2010standing conflict between deep field localization and efficient external coupling in plasmonic systems can be resolved by multiscale structure design, promising the use of a single metal nanoparticle for advanced nanophotonic or optoelectronic devices.<\/jats:p>","DOI":"10.1515\/nanoph-2025-0331","type":"journal-article","created":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T06:39:52Z","timestamp":1762411192000},"page":"5069-5079","source":"Crossref","is-referenced-by-count":1,"title":["Near\u2010unity fueling light into a single plasmonic nanocavity"],"prefix":"10.1002","volume":"14","author":[{"given":"Haiming","family":"Ye","sequence":"first","affiliation":[{"name":"Key Laboratory of Artificial Micro\u2010 and Nano\u2010Structures of Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 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