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Proceedings Paper

Effect of shape, size, and periodicity variations on extraordinary thransmission through symmetric hole arrays in a 4 pair metallo-dielectric tuned metamaterial
Author(s): Emily A. Ray; Rene Lopez
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Paper Abstract

We show the effects of hole shape, size, and periodicity variation on extraordinary transmission through a tuned metamaterial of 4 pairs of alternating layers of Ag-Al2O3 with 20 nm thicknesses under illumination of TM light. The advantage of a metamaterial over a Ag film of similar thickness is the tunability of the surface plasmons coupling k-vector. Because their cross sections appear the same in fourier space, incident TM light sees the same structure for circular, square, and rectangular holes transmission is unaffected by these shape variations. Further, as we increase the hole size, the transmission does not exhibit the expected enhancement as both the 250 nm and 150 nm diameter holes are both too small to have their maxima overlap with the tuned transmission enhancement of the metamaterial. For the metamaterial, we are able to tune it to support surface plasmons from periodicities ranging from 130 nm to 215 nm, which effectively shifts the transmission peaks from the blue end of the spectrum in Ag films across the visible and into the red.

Paper Details

Date Published: 20 September 2011
PDF: 8 pages
Proc. SPIE 8096, Plasmonics: Metallic Nanostructures and Their Optical Properties IX, 80963L (20 September 2011); doi: 10.1117/12.894291
Show Author Affiliations
Emily A. Ray, The Univ. of North Carolina at Chapel Hill (United States)
Rene Lopez, The Univ. of North Carolina at Chapel Hill (United States)

Published in SPIE Proceedings Vol. 8096:
Plasmonics: Metallic Nanostructures and Their Optical Properties IX
Mark I. Stockman, Editor(s)

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