Vertically illuminated TW-UTC photodiodes for terahertz generation
Paper i proceeding, 2012

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.

Radiation source

Traveling wave

Laser mixing



Local oscillator



C. M. Barrientos Z

Universidad de Chile (UCH)

Victor Calle

Universidad de Chile (UCH)


J. A. Alvarez B


Universidad de Chile (UCH)

F. P. Mena


Universidad de Chile (UCH)

Josip Vukusic

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Jan Stake

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

E. A. Michael

Universidad de Chile (UCH)

Proceedings of SPIE - The International Society for Optical Engineering

0277786X (ISSN)

Vol. 8452 84522I


Elektroteknik och elektronik





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