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Kramers–Kronig analysis on the real refractive index of porous media in the terahertz spectral range |
Optics Letters, Vol. 36, Issue 5, pp. 778-780 (2011)
http://dx.doi.org/10.1364/OL.36.000778
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Abstract
We present a terahertz time-domain experimental technique for the detection of scattering from porous media. The method for detection of the scattering enables one to make a decision when Fresnel or Kramers–Kronig (K-K) anal ysis can be applied for a porous medium. In this study the real refractive index of a tablet is calculated using the conventional K-K dispersion relation and also using a singly subtractive K-K relation, which are applied to the extinction coefficient obtained from the Beer–Lambert law. The advantage of the K-K analysis is that one gets estimates both for absolute refractive index and also dispersion of the porous tablet, whereas Fresnel analysis provides only the absolute value of the index.
© 2011 Optical Society of America
OCIS Codes
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(120.7000) Instrumentation, measurement, and metrology : Transmission
(300.6270) Spectroscopy : Spectroscopy, far infrared
ToC Category:
Instrumentation, Measurement, and Metrology
History
Original Manuscript: November 18, 2010
Revised Manuscript: January 25, 2011
Manuscript Accepted: January 31, 2011
Published: March 1, 2011
Citation
Pertti Silfsten, Ville Kontturi, Tuomas Ervasti, Jarkko Ketolainen, and Kai-Erik Peiponen, "Kramers–Kronig analysis on the real refractive index of porous media in the terahertz spectral range," Opt. Lett. 36, 778-780 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-5-778
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