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.
heterostructure barrier varactors
MMICs
Schottky diode
heterodyne receiver
CH3OH
molecular spectroscopy
mHEMT
power amplifiers
terahertz
methanol
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
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Gigahertzcentrum
Vladimir Drakinskiy
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Peter Sobis
Gigahertzcentrum
Anders Emrich
Omnisys Instruments
Axel Hülsmann
Fraunhofer-Institut fur Angewandte Festkorperphysik - IAF
Tom Johansen
Danmarks Tekniske Universitet (DTU)
Tomas Bryllert
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Gigahertzcentrum
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
Atom- och molekylfysik och optik
Annan elektroteknik och elektronik
Infrastruktur
Nanotekniklaboratoriet
DOI
10.1109/TTHZ.2014.2326554