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While transition metal dichalcogenides are promising candidates for such confinement, achieving tunable strong coupling often relies on patterned plasmonic nanostructures or chemical modification of the excitonic material. Furthermore, in metal\u2010coupled systems, the distinct role of metallic mirror\u2010induced electromagnetic confinement is often experimentally obscured by exciton\u2010plasmon energy hybridization. Here we introduce a vdW\u2010integrated, chemically non\u2010invasive WS\n                    <jats:sub>2<\/jats:sub>\n                    \/h\u2010BN\/Au heterostructure in which the h\u2010BN spacer forms a controllable nanogap that tunes image\u2010charge confinement while preserving the excitonic material. Scattering\u2011type near\u2011field microscopy directly maps propagating interference fringes and reveals a collapse of the TM\u2011polariton wavelength to \u223c172\u00a0nm under 633\u2011nm excitation as the spacer is reduced to 5\u00a0nm (\n                    <jats:italic>\u03bb<\/jats:italic>\n                    <jats:sub>0<\/jats:sub>\n                    \/\n                    <jats:italic>\u03bb<\/jats:italic>\n                    <jats:sub>p<\/jats:sub>\n                    \u22483.7, corresponding to \u223c71% wavelength reduction), which is one of the highest degrees of optical confinement reported for room\u2010temperature TMDC polaritons. Full\u2011wave simulations and transfer\u2011matrix analysis, aided by boundary\u2011condition engineering from an ideal conductor to real Au, separate a purely geometric mirror mode from plasmon\u2011assisted hybridization. This platform establishes a deterministic route to deeply subwavelength field control, offering a scalable architecture for nonlinear optical enhancement and integrated quantum devices.\n                  <\/jats:p>","DOI":"10.1002\/adma.74437","type":"journal-article","created":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T11:05:49Z","timestamp":1785582349000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mirror\u2011Induced Field Compression Drives Tunable Strong Exciton\u2013Plasmon Polaritons in WS\n                    <sub>2<\/sub>\n                    \/h\u2010BN\/Au Heterostructures"],"prefix":"10.1002","volume":"38","author":[{"given":"Xiu\u2010Qi","family":"Shi","sequence":"first","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun\u2010Rong","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhao\u2010Dong","family":"Meng","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi\u2010Cheng","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li\u2010Lin","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong\u2010Jia","family":"Yao","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhi\u2010Peng","family":"Dong","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science and Technology Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"En\u2010Ming","family":"You","sequence":"additional","affiliation":[{"name":"School of Ocean Information Engineering Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent Processing Jimei University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Yi","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering State Key Laboratory of Physical Chemistry of Solid Surfaces College of Physical Science 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,1]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361\u20106633\/ac45f9"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms9579"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsphotonics.8b01766"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.newton.2025.100288"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202418230"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.129.057402"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202504526"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202501376"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.nanolett.1c04800"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202208952"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature14290"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202104954"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202312127"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202104164"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202208761"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202008070"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.201901003"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat4792"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aag1992"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202311568"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202405978"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202302045"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202316863"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.nanolett.4c03294"},{"key":"e_1_2_9_26_1","doi-asserted-by":"crossref","unstructured":"M.Lang 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