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As a complementary Zr\u2010based member of this material family, zirconium disulfide\u00a0() combines a comparably broad first Reststrahlen band with semiconducting electronic character, providing a wide spectral window for phonon\u2010dominated far\u2010infrared hyperbolic polaritonics. Here, we report the first experimental demonstration of far\u2010infrared hyperbolic phonon polaritons in the group\u2010IVB TMD  using a resonator\u2010assisted far\u2010field spectroscopy platform. An unpatterned  flake integrated with a metallic ribbon array forms a phonon polariton resonator, enabling efficient far\u2010field excitation of phonon polaritons while suppressing extrinsic scattering losses. This high coupling efficiency enables far\u2010field observation of multiple polaritonic resonances beyond the fundamental branch. The large normalized light\u2013matter coupling strength of  enables ultrahigh in\u2010plane momenta, with effective refractive indices as high as 223. Despite this extreme confinement, linewidth analysis indicates that the measured damping is primarily governed by intrinsic propagation loss, corresponding to a sub\u2010picosecond polariton lifetime. These results establish  as a van der Waals hyperbolic material platform for ultraconfined far\u2010infrared phonon polaritons and highlight the potential of group\u2010IVB TMDs for compact far\u2010infrared nanophotonic and thermal photonic\u00a0applications.<\/jats:p>","DOI":"10.1002\/adma.74154","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T04:42:27Z","timestamp":1786077747000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Far\u2010Infrared Hyperbolic Phonon\u2013Polaritons in Zirconium Disulfide"],"prefix":"10.1002","volume":"38","author":[{"given":"Subhodip","family":"Saha","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan","family":"Kowalski","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Vanderbilt University Nashville Tennessee USA"},{"name":"Interdisciplinary Materials Science Program Vanderbilt University Nashville Tennessee USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph R.","family":"Matson","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Vanderbilt University Nashville Tennessee USA"},{"name":"Interdisciplinary Materials Science Program Vanderbilt University Nashville Tennessee USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas G.","family":"Folland","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy The University of Iowa Iowa City Iowa USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tony","family":"Low","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 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