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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 19769–19777

Low-temperature THz time domain waveguide spectrometer with butt-coupled emitter and detector crystal

W. Qiao, D. Stephan, M. Hasselbeck, Q. Liang, and T. Dekorsy  »View Author Affiliations

Optics Express, Vol. 20, Issue 18, pp. 19769-19777 (2012)

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A compact high-resolution THz time-domain waveguide spectrometer that is operated inside a cryostat is demonstrated. A THz photo-Dember emitter and a ZnTe electro-optic detection crystal are directly attached to a parallel copper-plate waveguide. This allows the THz beam to be excited and detected entirely inside the cryostat, obviating the need for THz-transparent windows or external THz mirrors. Since no external bias for the emitter is required, no electric feed-through into the cryostat is necessary. Using asynchronous optical sampling, high resolution THz spectra are obtained in the frequency range from 0.2 to 2.0 THz. The THz emission from the photo-Dember emitter and the absorption spectrum of 1,2-dicyanobenzene film are measured as a function of temperature. An absorption peak around 750 GHz of 1,2-dicyanobenzene displays a blue shift with increasing temperature.

© 2012 OSA

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(230.7370) Optical devices : Waveguides
(300.1030) Spectroscopy : Absorption
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: May 1, 2012
Revised Manuscript: June 25, 2012
Manuscript Accepted: July 31, 2012
Published: August 14, 2012

W. Qiao, D. Stephan, M. Hasselbeck, Q. Liang, and T. Dekorsy, "Low-temperature THz time domain waveguide spectrometer with butt-coupled emitter and detector crystal," Opt. Express 20, 19769-19777 (2012)

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