We report experimental results for the optical responsivity and noise-equivalent power (NEP) of quasi-optically
coupled, room-temperature ErAs-InGaAlAs rectifier diodes. Four-micron-diameter diodes were flip-chip coupled to
self-complementary log-periodic and square-spiral antennas, and characterized with a 104-GHz Gunn diode oscillator
coupled to the rectifiers through variable attenuators, a feedhorn, an aspherical polymeric lens, and a Si
hyperhemisphere. The log-periodic mounted device displayed a responsivity and specific NEP' of 0.9x103 V/W and
1.2x10-12 W/Hz1/2, respectively. The square-spiral mounted device displayed a responsivity and NEP' of 1.2x103 V/W
and 2.0x10-12 W/Hz 1/2, respectively. All values were measured at a post-detection center frequency of 33 Hz.
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