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2018
Journal Article
Titel
Field-effect transistor based detectors for power monitoring of THz quantum cascade lasers
Abstract
We report on circuit simulation, modeling, and characterization of field-effect transistor based terahertz (THz) detectors (TeraFETs) with integrated patch antennas for discrete frequencies from 1.3 to 5.7 THz. The devices have been fabricated using a standard 90-nm CMOS technology. Here, we focus in particular on a device showing the highest sensitivity to 4.75-THz radiation and its prospect to be employed for power monitoring of a THz quantum cascade laser used in a heterodyne spectrometer GREAT (German REceiver for Astronomy at Terahertz frequencies). We show that a distributed transmission line based detector model can predict the detector's performance better than a device model provided by the manufacturer. The integrated patch antenna of the TeraFET designed for 4.75 THz has an area of 13×13 m m 2 and a distance of 2.2 m m to the ground plane. The modeled radiation efficiency at the target frequency is 76% with a maximum directivity of 5.5, resulting in an effective area of 1750 m m 2 . The detector exhibits an area-normalized minimal noise-equivalent power of 404 pW/SRHz and a maximum responsivity of 75 V/W. These values represent the state of the art for electronic detectors operating at room-temperature and in this frequency range.
Author(s)
Zdanevicius, Justinas
Institute of Applied Electrodynamics and Telecommunications, Vilnius University, Vilnius, Lithuania
Cibiraite, Dovile
Physikalisches Institut, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
Ikamas, Kestutis
Institute of Applied Electrodynamics and Telecommunications, Vilnius University, Vilnius, Lithuania
Matukas, Jonas
Institute of Applied Electrodynamics and Telecommunications, Vilnius University, Vilnius, Lithuania
Lisauskas, Alvydas
Institute of Applied Electrodynamics and Telecommunications, Vilnius University, Vilnius, Lithuania
Hagelschuer, Till
Institute of Optical Sensor Systems, German Aerospace Center (DLR), Berlin, Germany
Krozer, Viktor
Physikalisches Institut, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany
Hübers, Heinz-Wilhelm
Institute of Optical Sensor Systems, German Aerospace Center (DLR), Berlin, Germany