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Applied Physics Letters / Volume 92 / Issue 2 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 92, 021107 (2008); http://dx.doi.org/10.1063/1.2831910 (3 pages)

The Christiansen effect in terahertz time-domain spectra of coarse-grained powders

Morten Franz1, Bernd M. Fischer2, and Markus Walther1

1Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder Str. 3, D-79104 Freiburg, Germany
2Centre of Biomedical Engineering and School of Electrical and Electronic Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia

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(Received 10 September 2007; accepted 13 December 2007; published online 14 January 2008)

Spectral distortions are commonly observed in terahertz transmission spectra of ground substances immersed in a transparent host medium. This effect originates from scattering due to the index contrast between the grains and diluent. A phenomenological expression quantitatively accounts for the scattering induced attenuation and the phase delay experienced by the electric field transmitted through the sample. Based on the knowledge of the refractive indices of the sample and the host material, we present a procedure to eliminate the scattering contribution from the absorption spectra.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

powders, refractive index, submillimetre wave spectra

PACS

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 78.70.Gq

    Microwave and radio-frequency interactions

  • 61.43.Gt

    Powders, porous materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2831910

PUBLICATION DATA

ISSN

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

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    Y. C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, Appl. Phys. Lett. 86, 241116 (2005)APPLAB000086000024241116000001.

    W. C. Price and K. S. Tetlow, J. Chem. Phys. 16, 1157 (1948)JCPSA6000016000012001157000001.


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