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This confinement can be further enhanced when a polaritonic mode couples to its mirror image in a metallic substrate, giving rise to acoustic hyperbolic polaritons (AHPs). While most previous studies have focused on volume\u2010confined AHPs (v\u2010AHPs), edge\u2010confined AHPs (e\u2010AHPs) remain experimentally elusive. Here, we provide the first near\u2010field observation of e\u2010AHPs by launching and imaging them in the prototypical sample of hexagonal boron nitride (hBN) on a gold substrate. Unlike v\u2010AHPs propagating inside hBN, these e\u2010AHPs are guided along the hBN edges and exhibit shorter polariton wavelengths, as revealed by both near\u2010field imaging and extracted dispersion relations. Enhanced vibrational strong coupling in e\u2010AHPs, experimentally verified by monitoring molecular\u2010induced near\u2010field responses, demonstrates their suitability for high\u2010sensitivity molecule detection. These distinctive properties establish e\u2010AHPs as a promising platform for optical sensing and on\u2010chip nanophotonic devices.<\/jats:p>","DOI":"10.1002\/advs.202520556","type":"journal-article","created":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T07:02:02Z","timestamp":1767596522000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Observation of Edge\u2010Confined Acoustic Hyperbolic Polaritons in van der Waals Materials"],"prefix":"10.1002","volume":"13","author":[{"given":"Tianning","family":"Zhang","sequence":"first","affiliation":[{"name":"Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan China"},{"name":"Optics Valley Laboratory  Hubei China"},{"name":"Hubei Optical Fundamental Research Center  Wuhan China"},{"name":"China Electric Power Research Institute  Beiiing 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