{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T02:58:09Z","timestamp":1792033089330,"version":"4.4.0"},"reference-count":57,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T00:00:00Z","timestamp":1767830400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"},{"start":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T00:00:00Z","timestamp":1767830400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Guiding, storing, and processing light at the nanoscale hinges on understanding how polaritons \u2014 hybrid quasiparticles of light and matter \u2014 propagate and interfere in both space and time. This work introduces a synchrotron\u2010based technique, SYnchrotron SpaceTimE Mapping (SYSTEM), which captures real\u2010time evolution of polariton wave packets with \u223c10\u00a0nm spatial and sub\u2010100\u00a0fs temporal resolution across an ultrabroadband 5\u201350\u00a0THz range. Here, SYSTEM directly visualizes the creation, interference, and decay of multiple high\u2010quality Fabry\u2010P\u00e9rot phonon polariton cavity modes in an \u03b1\u2010MoO\n                    <jats:sub>3<\/jats:sub>\n                    microcavity. These real\u2010space, real\u2010time observations reveal wave\u2010packet dynamics and cavity resonances with record\u2010high quality factors (Q\u00a0\u2248\u00a0100) in the single\u2010digit terahertz regime near 9\u00a0THz. SYSTEM thus offers a powerful and broadly applicable platform for probing and engineering ultraslow, deeply subwavelength polaritons, opening new avenues for tailoring light\u2013matter interactions and advancing next\u2010generation THz nanophotonic technologies.\n                  <\/jats:p>","DOI":"10.1002\/smll.202505899","type":"journal-article","created":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T12:03:27Z","timestamp":1767873807000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Ultrabroadband Spacetime Nanoscopy of Terahertz Polaritons in a van der Waals Cavity"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8416-953X","authenticated-orcid":false,"given":"Lukas","family":"Wehmeier","sequence":"first","affiliation":[{"name":"National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 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