Molecular Spectroscopy With a Compact 557-GHz Heterodyne Receiver

Philipp F.-X. Neumaier, Heiko Richter, Jan Stake, Huan Zhao, Aik-Yean Tang, Vladimir Drakinskiy, Peter Sobis, Anders Emrich, Axel Hulsmann, Tom Keinicke Johansen, Tomas Bryllert, Johanna Hanning, Viktor Krozer, Heinz-Wilhelm Hubers

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalIEEE Transactions on Terahertz Science and Technology
Volume4
Issue number4
Pages (from-to)469-478
Number of pages10
ISSN2156-342X
DOIs
Publication statusPublished - 2014

Keywords

  • CH3OH
  • heterostructure barrier varactors
  • methanol
  • mHEMT
  • Mixers
  • MMICs
  • molecular spectroscopy
  • power amplifiers
  • Schottky diode
  • terahertz

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