Abstract
We numerically investigate the trade-offs between the dispersion properties,
coupling efficiency, and geometrical constraints in dual-wire (twin-lead) terahertz
(THz) waveguides. In particular, we show that their inherent linearly polarized
quasi-transverse electromagnetic (TEM) modes exist for waveguide transverse
dimensions comparable with the wavelength, enabling significant end-fire coupling
(>10%) for numericalaperture limited Gaussian beams while supporting a relatively
low-dispersion propagation of below 0.5 ps2/m, as desired for short-pulse
time-domain spectroscopy applications. Starting from the dual-wire structure, we
also demonstrate that low-dispersion tapers can be designed to improve coupling
efficiency.
© 2011 Chinese Optics Letters
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