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Proceedings Paper

Vertically illuminated TW-UTC photodiodes for terahertz generation
Author(s): Claudio M. Barrientos Z.; Victor H. Calle G.; Jaime A Alvarez; F. Patricio Mena; Josip Vukusic; Jan Stake; Ernest A. Michael
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Paper Abstract

More efficient and powerful continuous-wave photonic mixers as terahertz sources are motivated by the need of more versatile local oscillators for submillimeter/terahertz receiver systems. Uni-Travelling Carrier (UTC) photodiodes are very prospective candidates for reaching this objective, but so far only have been reported as lumped-elements or as edge-illuminated optical-waveguide travelling-wave (TW) devices. To overcome the associated power limitations of those implementations, we are developing a novel implementation of the UTC photodiodes which combines a travelingwave photomixer with vertical velocity-matched illumination in a distributed structure. In this implementation called velocity-matched travelling-wave uni-travelling carrier photodiode, it is possible to obtain in-situ velocity matching of the beat-fringes of the two angled laser beams with the submm/THz-wave on the stripline. In this way, minimum frequency roll-off is achieved by tuning the angle between the two laser beams. A first design of these TW-UTC PDs from our Terahertz Photonics Laboratory at University of Chile has been micro-fabricated at the MC2 cleanroom facility at Chalmers Technical University.

Paper Details

Date Published: 24 September 2012
PDF: 11 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84522I (24 September 2012); doi: 10.1117/12.927440
Show Author Affiliations
Claudio M. Barrientos Z., Univ. de Chile (Chile)
Victor H. Calle G., Univ. de Chile (Chile)
Jaime A Alvarez, Univ. de Chile (Chile)
F. Patricio Mena, Univ. de Chile (Chile)
Josip Vukusic, Chalmers Univ. of Technology (Sweden)
Jan Stake, Chalmers Univ. of Technology (Sweden)
Ernest A. Michael, Univ. de Chile (Chile)

Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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