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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 30, Iss. 5 — May. 1, 2013
  • pp: 979–986

Revised metrology for enhanced accuracy in complex optical constant determination by THz-time-domain spectrometry

Oleksandr Sushko, Kastriot Shala, Rostyslav Dubrovka, and Robert Donnan  »View Author Affiliations


JOSA A, Vol. 30, Issue 5, pp. 979-986 (2013)
http://dx.doi.org/10.1364/JOSAA.30.000979


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Abstract

THz time-domain spectrometry (TDS) probes the complex polarization response of materials. Various analytical procedures are applied by many to extract the associated material optical constants. This has commonly been done by iteratively varying material parameters in order to achieve a match between experiment and a theoretical transfer function (TF). The poly root behavior of a TF is emphasized for measurements with reflections in the time domain. This study provides a comprehensive analysis of the influence of the initial guesses on the accuracy of extracted material parameters. In addition, various ways of representing multiple reflections inside the sample (a Fabry–Perot-like effect) are compared and their contribution to the uncertainty of material parameters is analyzed. Experimental evidence is provided where appropriate to support theoretical statements. Furthermore, this paper offers a basis for data comparison between different THz-TDS systems in transmission mode. Finally, a clear distinction is made between a commonly used basic analysis and an enhanced one, in terms of associated uncertainties in determination of the real and imaginary parts of the complex refractive index.

© 2013 Optical Society of America

OCIS Codes
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(070.2025) Fourier optics and signal processing : Discrete optical signal processing
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: November 12, 2012
Revised Manuscript: March 27, 2013
Manuscript Accepted: April 1, 2013
Published: April 23, 2013

Citation
Oleksandr Sushko, Kastriot Shala, Rostyslav Dubrovka, and Robert Donnan, "Revised metrology for enhanced accuracy in complex optical constant determination by THz-time-domain spectrometry," J. Opt. Soc. Am. A 30, 979-986 (2013)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-30-5-979

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