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Terahertz cavity-enhanced attenuated total reflection spectroscopy

Appl. Phys. Lett. 86, 201116 (2005); doi:10.1063/1.1929072

Published 12 May 2005

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Robert Schiwon, Gerhard Schwaab, Erik Bründermann, and Martina Havenith
Ruhr-Universität Bochum, Physikalische Chemie II - NC 7/72, D-44780 Bochum, Germany
We realized cavity-enhanced absorption spectroscopy in the terahertz spectral region by combining multilayer mirrors with an attenuated total reflection technique. Using this technique, we were able to observe an absorbance of biological samples with a minimum detectable concentration as low as 8×10–10  mol/mm2. The absorbance between 75  cm–1 and 115  cm–1 was measured using a monolithic resonator of high-purity silicon. We demonstrate that the sensitivity of the attenuated total reflection design is significantly improved by adding multilayer mirrors for the THz region. ©2005 American Institute of Physics
History: Received 12 November 2004; accepted 31 March 2005; published 12 May 2005
Permalink: http://link.aip.org/link/?APPLAB/86/201116/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.57.Pt
    Submillimeter wave, microwave and radiowave spectrometers including magnetic resonance spectrometers, auxiliary equipment, and techniques
  • 42.79.Bh
    Optical lenses, prisms and mirrors
  • 87.80.-y
    Biological techniques and instrumentation; biomedical engineering
  • 42.15.Eq
    Optical system design
  • YEAR: 2005

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ISSN:
0003-6951 (print)   1077-3118 (online)
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