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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 22 — Oct. 27, 2008
  • pp: 17258–17267

Some considerations on the transmissivity of thin metal films

Ian R. Hooper and J. Roy Sambles  »View Author Affiliations

Optics Express, Vol. 16, Issue 22, pp. 17258-17267 (2008)

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As interest in plasmonics grows the optical properties of thin metal films becomes increasingly significant. Here we explore the transmissivity of thin metal films at normal incidence, from the ultraviolet to microwaves, and show how, contrary to simplistic treatments, the microwave transmissivity may be much less than the optical transmissivity for films which are well below the skin depth in thickness. This arises because the film is acting as a zero order Fabry-Perot with very high reflectivity at each interface. The skin depth then becomes irrelevant for thin metal films at microwave frequencies. We also note in passing that the expected exponential dependence on thickness at higher thicknesses has an asymptotic limit at zero thickness which may be as high as four times the input intensity.

© 2008 Optical Society of America

OCIS Codes
(160.3900) Materials : Metals
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Thin Films

Original Manuscript: August 12, 2008
Revised Manuscript: September 24, 2008
Manuscript Accepted: September 27, 2008
Published: October 13, 2008

Ian R. Hooper and J. R. Sambles, "Some considerations on the transmissivity of thin metal films," Opt. Express 16, 17258-17267 (2008)

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