Hiroshi Ito; Toshihide Yoshimatsu; Hiroshi Yamamoto; Tadao Ishibashi
Resonant slot-antennas were integrated with uni-traveling-carrier photodiodes (UTC-PDs) for increasing THz-wave output power with relatively broad bandwidths. The measured output power was two to three times larger at its peak frequency than that of a non-resonant bowtie-antenna-integrated device. Output power enhancement was achieved at frequencies from 900 GHz to 1.6 THz for a narrow-slot UTC-PD and from 350 to 850 GHz for a wide-slot UTC-PD. Typical output power was 3.5 μW at 1.25 THz and 28 μW at 700 GHz for a photocurrent of 10 mA with a bias voltage of -0.4 V.