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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 67, Iss. 11 — Nov. 1, 1977
  • pp: 1537–1549

Causality calculations in reflection spectroscopy

Wilford N. Hansen and Wedad A. Abdou  »View Author Affiliations

JOSA, Vol. 67, Issue 11, pp. 1537-1549 (1977)

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A new method is presented for obtaining intrinsic absorption spectra (i.e., index of refraction and extinction coefficient versus wavelength) from reflection spectra of stratified media, which usually are complicated by substrate absorption, thin-layer interference patterns, etc. A typical application is to obtain intrinsic absorption spectra of an organic monolayer chemisorbed on the surface of a very thin metal film, which is in turn supported by a bulk substrate. The basis of the method is the proven causality of a special reflection function that we introduce, and the application of the transformation of Peterson and Knight to this function. The method is general, and has been found to give accurate results for various multiphase systems without restriction as to number of phases, angle of incidence, or polarization. While the method is valid for general stratified media, its accuracy depends upon the information content of the particular reflection spectrum taken. The sensitivity available can be calculated and the adjustable optical parameters chosen accordingly.

© 1977 Optical Society of America

Wilford N. Hansen and Wedad A. Abdou , "Causality calculations in reflection spectroscopy," J. Opt. Soc. Am. 67, 1537-1549 (1977)

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