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al M. Skorobogatiy Canada Research Chair in photonic crystals Outline ? Introduction ? Applications in the THz regime ? Early waveguide attempts Coplanar striplines, plastic ribbons, sapphire fibers, metal tubes ? Recent breaktroughs Metal wire, microstructured fiber, plastic fiber, hollow plastic tubes with inner metal layer ? Perspectives Bridges the gap between the microwave and optical regimes. n = THz 10 THz ?= 3000 mm 30 mm Major applications sensing, imaging and spectroscopy. Introduction What is the THz regime ? Applications ?Imaging of biological tissues (tissue recognition) L246。ffler, Opt. Exp., 9, 12 (2022) Applications ?Chemical recognition of gases Jacobsen, Opt. Lett., 21, 24 (1996) Time domain spectroscopy Applications ? Tomography Pearce, Opt. Lett., 30, 13 (2022) Mittleman, Opt. Lett., 22, 12 (1997) Applications ? Non destructive sensing Kawase, Opt. Exp., 11, 20 (2022) Combining imaging and spectroscopy for the detection of anic pounds Applications ? Non destructive sensing Kawase, Opt.