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THz refractive indices of tissues are retrieved for the two orthogonal linear polarizations of the incident beam, which are collinear and transverse toward the fibrous structures. The observed THz birefringence, as high as a few percent, is attributed to tissue morphology relying on the hematoxylin and eosin (H&amp;E)\u2010stained histology. Expectedly, the THz refractive index is higher for the incident field collinear to the fibrous structures. The muscle tissues and\n                    <jats:italic>Corpus callosum<\/jats:italic>\n                    manifest the most pronounced birefringence, while that of tendon is sufficiently lower. Our findings uncover notable heterogeneity and birefringence of tissues; those should be accounted for when developing novel methods of THz biophotonics.\n                  <\/jats:p>","DOI":"10.1002\/jbio.70232","type":"journal-article","created":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T07:26:23Z","timestamp":1769412383000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Heterogeneity and Birefringence of Soft Tissues Probed by the Polarization\u2010Sensitive Terahertz Solid Immersion Microscopy"],"prefix":"10.1002","volume":"19","author":[{"given":"D. R.","family":"Il'enkova","sequence":"first","affiliation":[{"name":"Prokhorov General Physics Institute of the Russian Academy of Sciences  Moscow Russia"},{"name":"Bauman Moscow State Technical University  Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D. 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