Vertically illuminated TW-UTC photodiodes for terahertz generation
Paper in proceedings, 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

Terahertz

Photomixer

Sub-millimeter

Traveling wave

Laser mixing

Local oscillator

Author

C. M. Barrientos Z

University of Chile (UCH)

Victor Calle

University of Chile (UCH)

Chalmers, Microtechnology and Nanoscience (MC2)

J. A. Alvarez B

University of Chile (UCH)

Chalmers, Microtechnology and Nanoscience (MC2)

F. P. Mena

Chalmers, Microtechnology and Nanoscience (MC2)

University of Chile (UCH)

Josip Vukusic

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Jan Stake

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

E. A. Michael

University of Chile (UCH)

Proceedings of SPIE - The International Society for Optical Engineering

0277786X (ISSN) 1996756X (eISSN)

Vol. 8452 84522I

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1117/12.927440

ISBN

978-081949153-4

More information

Latest update

2/7/2019 1