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Optical Engineering

Broadband photonic terahertz-wave emitter integrating uni-traveling-carrier photodiode and self-complementary planar antenna
Author(s): Hiroshi Ito; Toshihide Yoshimatsu; Hiroshi Yamamoto; Tadao Ishibashi
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Paper Abstract

Two types of photonic terahertz-wave emitters integrating self-complementary planar antennas (a log-periodic antenna or a bowtie antenna) and InP/InGaAs uni-traveling-carrier photodiodes have been fabricated and assembled in compact quasi-optical packages. Although both modules operated at frequencies from ∼150  GHz to 1.6 THz with similar output powers, the one with a log-periodic antenna exhibited a strongly dependent polarization angle of the output signal on frequency. We have found that the behavior in the lowest frequency range can be explained by a resonant mode along the periphery of the antenna by analyzing the resonance frequencies and the polarization angles. In contrast, the module with a bowtie antenna had stable polarization characteristics. The module had a good linearity of the output powers and could be operated even under zero bias conditions. The detected output powers were 59 μW at 350 GHz, 20 μW at 500 GHz, and 3.3 μW at 1 THz for a photocurrent of 10 mA with a bias voltage of only −0.6  V .

Paper Details

Date Published: 12 March 2014
PDF: 8 pages
Opt. Eng. 53(3) 031209 doi: 10.1117/1.OE.53.3.031209
Published in: Optical Engineering Volume 53, Issue 3
Show Author Affiliations
Hiroshi Ito, Kitasato Univ. (Japan)
Toshihide Yoshimatsu, NTT Photonics Labs. (Japan)
Hiroshi Yamamoto, Kitasato Univ. (Japan)
Tadao Ishibashi, NTT Photonics Labs. (Japan)


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