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31 May 2013 Broadband photonic terahertz-wave emitter integrating UTC-PD and novel planar antenna
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The uni-traveling-carrier photodiode (UTC-PD) is a novel PD that uses only electrons as the active carriers. This feature is the key for simultaneously realizing high operation speed and high output current, which are essential for generating terahertz (THz) waves with relatively high output power. To transmit electromagnetic waves, we integrated a novel compact planar antenna with a UTC-PD and assembled it in a quasi-optical package. The fabricated module had a relatively high responsivity of 0.21 A/W and was operated in an extremely wide frequency range from 30 GHz to 1.6 THz. The detected output powers were 120 μW at 200 GHz, 17 μW at 500 GHz, and 2.9 μW at 1 THz for a photocurrent of 10 mA with a bias voltage of only -0.6 V.
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Hiroshi Ito, Toshihide Yoshimatsu, Hiroshi Yamamoto, and Tadao Ishibashi "Broadband photonic terahertz-wave emitter integrating UTC-PD and novel planar antenna", Proc. SPIE 8716, Terahertz Physics, Devices, and Systems VII: Advanced Applications in Industry and Defense, 871602 (31 May 2013); doi: 10.1117/12.2015523;

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