A 3.5-THz, x6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers
Journal article, 2021

Efficient and compact frequency converters are essential for frequency stabilization of terahertz sources. In this paper, we present a 3.5-THz, 6-harmonic, integrated Schottky diode mixer operating at room temperature. The designed frequency converter is based on a single-ended, planar Schottky diode with a sub-micron anode contact area defined on a suspended 2-m ultra-thin GaAs substrate. The dc-grounded anode pad with the radio frequency E-plane probe resulted in an electrically compact circuit. At 200 MHz intermediate frequency, a mixer conversion loss of about 59 dB is measured resulting in a 40 dB signal-to-noise ratio for phase locking a 3.5-THz quantum-cascade laser. Using a quasi-static diode model combined with electromagnetic simulations, good agreement with the measured results was obtained. Harmonic frequency converters without the need of cryogenic cooling will help in the realization of highly sensitive space and air-borne heterodyne receivers.

phase locking

frequency stabilization

terahertz electronics

Frequency converters

mixer characterization

Schottky diodes

heterodyne receivers

quantum-cascade lasers

integrated circuits

harmonic mixers


Divya Jayasankar

Vladimir Drakinskiy

Nick Rothbart

Heiko Richter

Xiang Lü

Lutz Schrottke

Holger T. Grahn

Martin Wienold

Heinz-Wilhelm Hübers

IEEE Transactions on Terahertz Science and Technology

2156-342X (ISSN)

Vol. 11 6 684-694

THz metrology for modern wireless systems

Swedish Foundation for Strategic Research (SSF) (FID17-0040), -- .

THz Schottky diode mixers for high resolution FIR spectroscopy

Swedish National Space Board (170/17), 2018-01-01 -- 2019-12-31.

Swedish National Space Board, 2018-01-01 -- 2019-12-31.

Areas of Advance

Information and Communication Technology


Kollberg Laboratory

Nanofabrication Laboratory

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering



More information

Latest update