Molecular Spectroscopy With a Compact 557-GHz Heterodyne Receiver
Artikel i vetenskaplig tidskrift, 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
Författare
Philipp Neumaier
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Heiko Richter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Jan Stake
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Gigahertzcentrum
Huan Zhao Ternehäll
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Aik-Yean Tang
Gigahertzcentrum
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Vladimir Drakinskiy
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Peter Sobis
Gigahertzcentrum
Anders Emrich
Omnisys Instruments
Axel Hülsmann
Fraunhofer-Gesellschaft
Tom Johansen
Danmarks Tekniske Universitet (DTU)
Tomas Bryllert
Gigahertzcentrum
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Johanna Hanning
Gigahertzcentrum
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Viktor Krozer
Johann Wolfgang Goethe Universität Frankfurt am Main
Ferdinand-Braun-Institut fur Hochstfrequenztechnik
Heinz-Wilhelm Hübers
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
IEEE Transactions on Terahertz Science and Technology
2156-342X (ISSN) 21563446 (eISSN)
Vol. 4 4 469-478 6825917Styrkeområden
Informations- och kommunikationsteknik
Drivkrafter
Hållbar utveckling
Innovation och entreprenörskap
Ämneskategorier (SSIF 2011)
Atom- och molekylfysik och optik
Annan elektroteknik och elektronik
Infrastruktur
Myfab (inkl. Nanotekniklaboratoriet)
DOI
10.1109/TTHZ.2014.2326554