Molecular Spectroscopy With a Compact 557-GHz Heterodyne Receiver
Journal article, 2014
We report on a heterodyne terahertz spectrometer based on a fully integrated 557-GHz receiver and a digital fast Fourier transform spectrometer. The receiver consists of a chain of multipliers and power amplifiers, followed by a heterostructure barrier varactor tripler that subharmonically pumps a membrane GaAs Schottky diode mixer. All sub-components are newly developed and optimized with regard to the overall receiver performance such as noise temperature, power consumption, weight and physical size. The receiver works at room temperature, has a double sideband noise temperature as low as 2000 K at a maximum power consumption of 4.5 W with an Allan time of 10 s and a sideband gain ratio of 0.52. The performance of the spectrometer is demonstrated by absorption spectroscopy of H2O and CH3OH with an instantaneous bandwidth of 1.5 GHz and a resolution of 183 kHz. Several pressure broadening parameters of methanol absorption lines were determined, that agree with other published data. Using the experimentally determined molecular parameters the CH3OH absorption spectrum could be modeled with very high precision.
CH3OH
methanol
terahertz
MMICs
molecular spectroscopy
Schottky diode
mHEMT
power amplifiers
heterodyne receiver
heterostructure barrier varactors
Author
Philipp Neumaier
German Aerospace Center (DLR)
Heiko Richter
German Aerospace Center (DLR)
Jan Stake
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
GigaHertz Centre
Huan Zhao Ternehäll
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Aik-Yean Tang
GigaHertz Centre
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Vladimir Drakinskiy
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Peter Sobis
GigaHertz Centre
Anders Emrich
Omnisys Instruments
Axel Hülsmann
Fraunhofer Society
Tom Johansen
Technical University of Denmark (DTU)
Tomas Bryllert
GigaHertz Centre
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Johanna Hanning
GigaHertz Centre
Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory
Viktor Krozer
Goethe University Frankfurt
Ferdinand-Braun-Institut fur Hochstfrequenztechnik
Heinz-Wilhelm Hübers
German Aerospace Center (DLR)
Technische Universität Berlin
IEEE Transactions on Terahertz Science and Technology
2156-342X (ISSN) 21563446 (eISSN)
Vol. 4 4 469-478 6825917Areas of Advance
Information and Communication Technology
Driving Forces
Sustainable development
Innovation and entrepreneurship
Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
Other Electrical Engineering, Electronic Engineering, Information Engineering
Infrastructure
Myfab (incl. Nanofabrication Laboratory)
DOI
10.1109/TTHZ.2014.2326554