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.

power amplifiers

terahertz

mHEMT

methanol

molecular spectroscopy

heterodyne receiver

Schottky diode

heterostructure barrier varactors

MMICs

CH3OH

Författare

Philipp Neumaier

Deutsches Zentrum fur Luft- Und Raumfahrt

Heiko Richter

Deutsches Zentrum fur Luft- Und Raumfahrt

Jan Stake

GigaHertz Centrum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Huan Zhao Ternehäll

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Aik-Yean Tang

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

GigaHertz Centrum

Vladimir Drakinskiy

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Peter Sobis

GigaHertz Centrum

Anders Emrich

Omnisys Instruments AB

Axel Hülsmann

Fraunhofer-Institut fur Angewandte Festkorperphysik - IAF

Tom Johansen

Danmarks Tekniske Universitet (DTU)

Tomas Bryllert

GigaHertz Centrum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Johanna Hanning

GigaHertz Centrum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Viktor Krozer

Johann Wolfgang Goethe Universität Frankfurt am Main

Ferdinand-Braun-Institut fur Hochstfrequenztechnik

Heinz-Wilhelm Hübers

Deutsches Zentrum fur Luft- Und Raumfahrt

Technische Universität Berlin

IEEE Transactions on Terahertz Science and Technology

2156-342X (ISSN)

Vol. 4 469-478 6825917

Styrkeområden

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