Matsuura, Shuji and Blake, Geoffrey A. and Wyss, Rolf A. and Pearson, J. C. and Kadow, Christopher and Jackson, Andrew W. and Gossard, Arthur C. (1999) Design and characterization of optical-THz phase-matched traveling-wave photomixers. In: Terahertz and Gigahertz Photonics. Proceedings of SPIE. No.3795. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 484-492. ISBN 0-8194-3281-4 http://resolver.caltech.edu/CaltechAUTHORS:20121003-113301502
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Design and characterization of optical-THz phase-matched traveling-wave photomixers for difference-frequency generation of THz waves are presented. A de-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 ~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 I THz, owing to their great thermal dissipation capability and capacitance-free wide bandwidth.
|Item Type:||Book Section|
|Additional Information:||© 1999 SPIE. The authors would like to thank T. E. Turner in the Microelectronics Device Laboratory at JPL for device fabrication. This research was sponsored by the Jet Propulsion Laboratory, California Institute of Technology, and the National Aeronautics and Space Administration. The work performed at UCSB was supported by the Center for Nonstoichiometric III-V Semiconductors.|
|Official Citation:||Shuji Matsuura ; Geoffrey A. Blake ; Rolf A. Wyss ; John C. Pearson ; Christoph Kadow ; Andrew W. Jackson and Arthur C. Gossard "Design and characterization of optical-THz phase-matched traveling-wave photomixers", Proc. SPIE 3795, Terahertz and Gigahertz Photonics, 484 (November 12, 1999); doi:10.1117/12.370198; http://dx.doi.org/10.1117/12.370198|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||03 Oct 2012 22:18|
|Last Modified:||27 Dec 2012 02:48|
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