Abstract
A novel terahertz (THz) waveguide was theoretically designed based on polymethylmethacrylate (PMMA) negative curvature fiber. The confinement loss decreased 3.5 times when there were optimum gaps between adjacent cladding tubes of the fibers with six tubes. Confinement loss as low as 0.08 dB/cm and transmission bandwidth of 700 GHz were obtained when the tube wall thickness and gap range of the fiber were 40 μm and 357–416.5 μm, respectively, and the power ratio of the proposed fiber was as high as 99%. When the fiber had six surrounding tubes, the optimum gap was 6 times larger than the optimum gaps in fibers composed of eight or ten surrounding tubes. The PMMA negative curvature fibers with a broad range of gap made it well-suited for THz transmission with low confinement loss and wide bandwidth.
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