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.

heterostructure barrier varactors

MMICs

Schottky diode

heterodyne receiver

CH3OH

molecular spectroscopy

mHEMT

power amplifiers

terahertz

methanol

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

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

GigaHertz Centre

Vladimir Drakinskiy

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Peter Sobis

GigaHertz Centre

Anders Emrich

Omnisys Instruments

Axel Hülsmann

Fraunhofer-Institut fur Angewandte Festkorperphysik - IAF

Tom Johansen

Technical University of Denmark (DTU)

Tomas Bryllert

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

GigaHertz Centre

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)

Vol. 4 4 469-478 6825917

Areas of Advance

Information and Communication Technology

Driving Forces

Sustainable development

Innovation and entrepreneurship

Subject Categories

Atom and Molecular Physics and Optics

Other Electrical Engineering, Electronic Engineering, Information Engineering

Infrastructure

Nanofabrication Laboratory

DOI

10.1109/TTHZ.2014.2326554

More information

Latest update

9/6/2018 1