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Their construction involves a multi\u2010step synthetic method beginning with Au@Pt nanodisks, followed by facet\u2010controlled Ag overgrowth as a sacrificial layer and subsequent formation of the inner cavity and Au trenches. This architecture confines light within the trench nanogaps and between the nanodisk core and the hollow cavity. Structural parameters such as nanogap and shell thickness can be systematically tuned to clarify e\u2010field enhancement mechanisms within a single particle. Single\u2010particle surface\u2010enhanced Raman spectroscopy (SERS) and finite element method simulations reveal that DiTDs with an optimal trench gap (12.8\u00a0nm) and thin shell (15.9\u00a0nm), which enable effective coupling between the inner cavity and nanogap at 785\u00a0nm excitation, exhibit strong near\u2010field focusing. These findings indicate that SERS enhancement is governed by both gap miniaturization and three\u2010dimensional plasmonic interactions throughout the nanoparticle.<\/jats:p>","DOI":"10.1002\/smll.74127","type":"journal-article","created":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T06:40:06Z","timestamp":1780900806000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Enhanced Near\u2010Field Focusing via Interior Cavity and Nanogap Coupling in Disk\u2013Cavity\u2013Trench Nanostructures"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-6626-7365","authenticated-orcid":false,"given":"Kyuvin","family":"Hur","sequence":"first","affiliation":[{"name":"Department of Chemistry Yonsei University  Seoul Republic of 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