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Here, a cavity\u2010defined plasmonic nanolaser platform is realized through van der Waals integration of layered Indium Selenide (InSe) gain media with lithographically engineered Au cavities separated by an ultrathin hexagonal boron nitride (hBN) spacer. Owing to the direct bandgap and predominantly out\u2010of\u2010plane (OP) emission dipole of InSe, efficient coupling to surface plasmon polariton (SPP) modes is achieved. Clear near\u2010infrared (NIR) lasing characteristics, including a well\u2010defined threshold, pronounced linewidth narrowing, and a drastic reduction of carrier lifetime, are observed under optical pumping. A plasmonic lasing regime below the optical\u2010mode cutoff is identified, with lasing sustained for InSe thicknesses down to 79\u00a0nm, well beyond the limit of conventional photonic\u2010mode lasers. Spatially resolved spectroscopy and numerical simulations reveal that the lasing feedback is governed by cavity\u2010defined SPP modes. In addition, deterministic control of lasing behavior is achieved by engineering Au cavities with diverse geometries, establishing a versatile and general plasmonic nanolaser architecture.<\/jats:p>","DOI":"10.1002\/adma.73996","type":"journal-article","created":{"date-parts":[[2026,7,12]],"date-time":"2026-07-12T06:30:12Z","timestamp":1783837812000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cavity\u2010Defined van der Waals Plasmonic Nanolasers Enabled by Out\u2010Of\u2010Plane Dipole Coupling"],"prefix":"10.1002","volume":"38","author":[{"given":"Yong","family":"Liu","sequence":"first","affiliation":[{"name":"Hunan Institute of Optoelectronic Integration and Key Laboratory For Micro\u2010Nano Physics and Technology of Hunan Province College of Materials Science and Engineering Hunan University  Changsha P. R. 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