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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 4 — Feb. 1, 2007
  • pp: 502–505

Closed equation for the normal incidence reflectance of thin films on absorbing substrates

William E. Vargas and Diego Castro  »View Author Affiliations


Applied Optics, Vol. 46, Issue 4, pp. 502-505 (2007)
http://dx.doi.org/10.1364/AO.46.000502


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Abstract

The optical constants of thin films can be obtained from inversion of spectrophotometric measurements by using minimization gradient methods. The computational approach of these minimization methods requires closed compact formulas for reflectance and∕or transmittance. For normal incidence closed compact formulations for the direct transmittance, both for thin films on transparent or absorbing substrates, and for the reflectance of thin films on transparent substrates, are available in the literature. We report here a closed compact formula to evaluate reflectance spectra of thin films on absorbing substrates, and it is shown that for vanishing substrate absorption this new, to the best of our knowledge, approach gives the same results obtained from the formulation corresponding to thin films supported by transparent substrates.

© 2007 Optical Society of America

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(160.4670) Materials : Optical materials
(240.0310) Optics at surfaces : Thin films
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Optical Computing

History
Original Manuscript: March 16, 2006
Revised Manuscript: July 10, 2006
Manuscript Accepted: September 2, 2006

Citation
William E. Vargas and Diego Castro, "Closed equation for the normal incidence reflectance of thin films on absorbing substrates," Appl. Opt. 46, 502-505 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-4-502

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