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Proceedings Paper

Design and characterization of optical-THz phase-matched traveling-wave photomixers
Author(s): Shuji Matsuura; Geoffrey A. Blake; Rolf A. Wyss; John C. Pearson; Christoph Kadow; Andrew W. Jackson; Arthur C. Gossard
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Paper Abstract

Design and characterization of optical-THz phase-matched traveling-wave photomixers for difference-frequency generation of THz waves are presented. A dc-biased coplanar stripline fabricated on low-temperature-grown GaAs is illuminated by two non-collinear laser beams which generate moving interference fringes that are accompanied by THz waves. By tuning the offset angle between the two laser beams, the velocity of the interference fringe can be matched to the phase velocity of the THz wave in the coplanar stripline. The generated THz waves are radiated into free space by the antenna at the termination of the stripline. Enhancement of the output power was clearly observed when the phase-matching condition was satisfied. The output power spectrum has a 3-dB bandwidth of 2 THz and rolls off as approximately 9 dB/Oct which is determined by the frequency dependent attenuation in the stripline, while the bandwidth of conventional photomixer design has the limitation by the RC time constant due to the electrode capacitance. The device can handle the laser power of over 380 mW, which is 5 times higher than the maximum power handring capability of conventional small area devices. The results show that the traveling-wave photomixers have the potential to surpass small area designs, especially at higher frequencies over 1 THz, owing to their great thermal dissipation capability and capacitance-free wide bandwidth.

Paper Details

Date Published: 12 November 1999
PDF: 9 pages
Proc. SPIE 3795, Terahertz and Gigahertz Photonics, (12 November 1999); doi: 10.1117/12.370198
Show Author Affiliations
Shuji Matsuura, California Institute of Technology (Japan)
Geoffrey A. Blake, California Institute of Technology (United States)
Rolf A. Wyss, Jet Propulsion Lab. (United States)
John C. Pearson, Jet Propulsion Lab. (United States)
Christoph Kadow, Univ. of California/Santa Barbara (United States)
Andrew W. Jackson, Univ. of California/Santa Barbara (United States)
Arthur C. Gossard, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 3795:
Terahertz and Gigahertz Photonics
R. Jennifer Hwu; Ke Wu, Editor(s)

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