Abstract

We design a hollow-core terahertz (THz) waveguide guiding a single linearly polarized mode. This is achieved using a hybrid cladding, where we introduce a ring of subwavelength structures, including metal wires and air-holes. The wire-based cladding is extremely anisotropic, reflecting only transverse magnetic (TM) modes. The polarization of TM modes is further manipulated by replacing some wires with air-holes. Numerical simulations confirm the guidance of only an $x$-polarized ${\mathrm{TM}}_2$ mode over 0.36–0.46 THz in a wavelength-scale core (diameter of 1 mm). The propagation losses are of the order $0.25\mathrm{dB}/\mathrm{cm}$, with low bend losses $<0.3\mathrm{dB}/\mathrm{cm}$ at 0.4 THz for a bend radius of 5 cm.

© 2016 Optical Society of America

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