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, Euclydes Marega

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Silver and gold films with thicknesses in the range of 120-450nm were evaporated onto glass substrates. A sequence of slits with widths varying between 70 and 270nm 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 632.8nm (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.
Original languageAmerican English
JournalApplied Optics
DOIs
StatePublished - 1 Nov 2011
Externally publishedYes

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