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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 31 — Nov. 1, 2011
  • pp: G11–G16

Influence of film thickness on the optical transmission through subwavelength single slits in metallic thin films

Fabio A. Ferri, Victor A. G. Rivera, Sérgio P. A. Osorio, Otávio B. Silva, Antonio R. Zanatta, Ben-Hur V. Borges, John Weiner, and Euclydes Marega, Jr.  »View Author Affiliations


Applied Optics, Vol. 50, Issue 31, pp. G11-G16 (2011)
http://dx.doi.org/10.1364/AO.50.000G11


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Abstract

Silver and gold films with thicknesses in the range of 120– 450 nm were evaporated onto glass substrates. A sequence of slits with widths varying between 70 and 270 nm was milled in the films using a focused gallium ion beam. We have undertaken high-resolution measurements of the optical transmission through the single slits with 488.0 nm (for Ag) and 632.8 nm (for Au) laser sources aligned to the optical axis of a microscope. Based on the present experimental results, it was possible to observe that (1) the slit transmission is notably affected by the film thickness, which presents a damped oscillatory behavior as the thickness is augmented, and (2) the transmission increases linearly with increasing slit width for a fixed film thickness.

© 2011 Optical Society of America

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(240.6680) Optics at surfaces : Surface plasmons
(310.6860) Thin films : Thin films, optical properties
(310.6628) Thin films : Subwavelength structures, nanostructures

History
Original Manuscript: June 22, 2011
Revised Manuscript: August 1, 2011
Manuscript Accepted: August 1, 2011
Published: September 15, 2011

Citation
Fabio A. Ferri, Victor A. G. Rivera, Sérgio P. A. Osorio, Otávio B. Silva, Antonio R. Zanatta, Ben-Hur V. Borges, John Weiner, and Euclydes Marega, Jr., "Influence of film thickness on the optical transmission through subwavelength single slits in metallic thin films," Appl. Opt. 50, G11-G16 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-31-G11


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