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By exploiting the extremely high phonon\u2010induced permittivity of titanium dioxide (TiO\n                    <jats:sub>2<\/jats:sub>\n                    ) at THz frequencies, we report broadband absorbers based on spaced TiO\n                    <jats:sub>2<\/jats:sub>\n                    nanotubes (NTs) fabricated by electrochemical anodization and thermal annealing featuring\u00a0\u223c\u00a080% absorptance from \u223c10\u00a0THz up to 300\u00a0THz. Furthermore, the structures displayed a broad (\u223c1\u00a0THz wide) and tunable absorption peak in the 1.4\u20133.6\u00a0THz range by simply controlling the annealing time. To map the millimeter\u2010wave\u2010to\u2010ultraviolet spectrum and to uncover the dielectric response of the NTs, a multi\u2010instrument spectroscopy characterization strategy was combined with full\u2010wave electromagnetic simulations. The tunable and broadband absorption of spaced TiO\n                    <jats:sub>2<\/jats:sub>\n                    NTs together with their high uniformity and scalable fabrication process open new opportunities for multipurpose low\u2010cost absorbers and compact room\u2010temperature THz devices.\n                  <\/jats:p>","DOI":"10.1002\/nap2.70231","type":"journal-article","created":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T04:19:51Z","timestamp":1785385191000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ultra\u2010Broadband Optical Characterization of TiO\n                    <sub>2<\/sub>\n                    Nanotube Arrays Revealing Annealing\u2010Tunable THz Absorption"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7864-8817","authenticated-orcid":false,"given":"Anjali","family":"Chaudhary","sequence":"first","affiliation":[{"name":"Department of Physics Indian Institute of Technology Delhi  New Delhi India"},{"name":"School of Physics and Astronomy University of Birmingham  Birmingham UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-6809-5759","authenticated-orcid":false,"given":"Morteza","family":"Afshar","sequence":"additional","affiliation":[{"name":"Czech Advanced Technology and Research Institute Regional Centre of Advanced Technologies and Materials Palack\u00fd University Olomouc  Olomouc Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emil J. 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