We have studied terahertz emission from interdigitated
finger photomixers coupled to planar antenna structures.
Using both pulsed and continuous-wave excitation, polarization
measurements reveal that the antenna design dominates the properties
of the radiated output at frequencies below 0.6 THz, while
the efficiency at higher frequencies is additionally dependent on
the design of the photomixer fingers. We have produced terahertz
maps of the device, characterizing the photomixer by measuring
the generated power as a function of the excitation position. Together,
these measurements have allowed us to understand better
the distinct roles of the photomixer and antenna in emission at
different fre
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