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Vertically illuminated TW-UTC photodiodes for terahertz generation

C. M. Barrientos Z ; Victor Calle ; J. A. Alvarez B ; F. P. Mena ; Josip Vukusic (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; Jan Stake (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; E. A. Michael
Proceedings of SPIE - The International Society for Optical Engineering. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, Amsterdam, 3-6 July 2012 (0277-786X). Vol. 8452 (2012),
[Konferensbidrag, refereegranskat]

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 traveling-wave 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.

Nyckelord: Laser mixing, Local oscillator, Photomixer, Radiation source, Sub-millimeter, Terahertz, Traveling wave



Denna post skapades 2013-01-23. Senast ändrad 2014-09-02.
CPL Pubid: 172033

 

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