Abstract
We demonstrate experimentally the coupling of a THz beam into a laser-machined
double-tapered thick slot waveguide operating between 0.3 and 2 THz. Simulation reveals
that the THz field generated by a standard photoconductive antenna coupled to an undoped
aspheric HRFZ-silicon focusing lens can be enhanced by 30 dB in the 40
${\bf \mu }$
m taper waist, relative to a traditional Gaussian beam waist (at 1
THz). Analysis of the 8 dB insertion loss reveals positive implications for coupling
between THz transceivers and in-plane-emitting antennas or low-loss THz
waveguides.
© 2014 IEEE
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