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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 3 — Jan. 20, 2007
  • pp: 327–334

Employing spectra of polycrystalline materials for the verification of optical constants obtained from corresponding low-symmetry single crystals

Thomas G. Mayerhöfer and Jürgen Popp  »View Author Affiliations


Applied Optics, Vol. 46, Issue 3, pp. 327-334 (2007)
http://dx.doi.org/10.1364/AO.46.000327


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Abstract

The determination of optical constants from spectra of low-symmetry single crystals or from spectra stemming from unfavorable crystal faces by dispersion analysis is a difficult task. Besides oscillator frequencies, band positions can additionally depend on oscillator strength as well as on the relative orientation of the transition moment. Therefore the results of the analysis are highly prone to errors. We present an easy method to validate the oscillator data resulting from dispersion analysis by the comparison of measured and simulated spectra of randomly oriented polycrystalline materials. Depending on the crystallite size, either average reflectance and transmittance theory (ARTT) or average refractive index theory (ARIT) can be applied to model the spectra of polycrystalline compounds. As an alternative to ARIT, effective medium theory (EMA) can also be employed. However, since principal dielectric functions do not exist in the general triclinic case, which are needed for the application of EMA, we suggest using the eigenvalues of the dielectric tensor function instead. Our method for the verification of optical constants of single crystals is validated using monoclinic CuO as an example.

© 2007 Optical Society of America

OCIS Codes
(260.1180) Physical optics : Crystal optics
(260.3060) Physical optics : Infrared
(300.6250) Spectroscopy : Spectroscopy, condensed matter

ToC Category:
Physical Optics

History
Original Manuscript: June 2, 2006
Manuscript Accepted: September 1, 2006
Published: January 4, 2007

Citation
Thomas G. Mayerhöfer and Jürgen Popp, "Employing spectra of polycrystalline materials for the verification of optical constants obtained from corresponding low-symmetry single crystals," Appl. Opt. 46, 327-334 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-3-327

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