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Polymer compounds from titania-doped polyethylene are fabricated and theirlinear optical properties characterized by THz-TDS. We show that highconcentration of dopants not only enhances the refractive index of thecomposite material, but also can dramatically raise its absorption coefficient.We demonstrate that the design of Bragg reflectors based on lossy compositepolymers depends on finding a compromise between index contrast andcorresponding losses. A small absorption value is also shown to be favorable,compared to an ideal lossless reflector, as it enables to smooth thetransmission passbands. Transmission measurements of a fabricated hollowcoreBragg fiber confirm simulation results.

High refractive index composite materials for THz waveguides: trade-off between index contrast and absorption loss