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They confine light to subwavelength scales, enhance electromagnetic fields in Fabry\u2013P\u00e9rot polaritonic resonators, and tune cavity resonance via adjusting external parameters (light frequency or dielectric environment). Thus, we propose tuning Fabry\u2013P\u00e9rot polaritonic resonators by modifying the dielectric environment through substrate phase transitions. We perform mid\u2010infrared nanoimaging of \u03b1\u2010MoO\n                    <jats:sub>3<\/jats:sub>\n                    nanocavities on phase\u2010change VO\n                    <jats:sub>2<\/jats:sub>\n                    at varying temperatures. At 25\u00b0C (VO\n                    <jats:sub>2<\/jats:sub>\n                    insulating phase), adjusting incident light frequency tunes the highly sensitive Fabry\u2013P\u00e9rot phononic polaritonic resonator order from 10 to 2; at 90\u00b0C (VO\n                    <jats:sub>2<\/jats:sub>\n                    metallic phase), the order tunes from 7 to 2. With incident light fixed at 992\u00a0cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    , the \u03b1\u2010MoO\n                    <jats:sub>3<\/jats:sub>\n                    nanocavity\/VO\n                    <jats:sub>2<\/jats:sub>\n                    heterojunction undergoes a low\u2010high\u2010low temperature cycle, showing a maximum Fabry\u2013P\u00e9rot resonance order change of 3, along with reversible tuning ability and delayed recovery. Simulations indicate higher\u2010order Fabry\u2013P\u00e9rot resonant modes can be achieved in thinner and wider \u03b1\u2010MoO\n                    <jats:sub>3<\/jats:sub>\n                    nanocavities. This method provides new means and experimental support for designing tunable Fabry\u2013P\u00e9rot resonant devices.\n                  <\/jats:p>","DOI":"10.1002\/nap2.70074","type":"journal-article","created":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T07:15:27Z","timestamp":1776323727000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reversible and Dynamic Tuning Mechanism for Fabry\u2013P\u00e9rot Polaritonic Resonators"],"prefix":"10.1002","volume":"15","author":[{"given":"Zhiqiang","family":"Shi","sequence":"first","affiliation":[{"name":"School of Science Minzu University of China  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongqian","family":"Zhao","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences  Beijing China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ying","family":"Liao","sequence":"additional","affiliation":[{"name":"Suzhou Laboratory  Suzhou Jiangsu China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rao","family":"Fu","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences  Beijing China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8093-940X","authenticated-orcid":false,"given":"Chen","family":"Ge","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences  Beijing China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuai","family":"Feng","sequence":"additional","affiliation":[{"name":"School of Science Minzu University of China  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jianing","family":"Chen","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences  Beijing China"},{"name":"School of Physical Sciences University of Chinese Academy of Sciences  Beijing China"},{"name":"Songshan Lake Materials Laboratory  Dongguan 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