Share Email Print
cover

Proceedings Paper

Surface-plasmon fields in two-dimensional arrays of gold nanodisks
Author(s): W. L. Johnson; S. A. Kim; Z. N. Utegulov; B. T. Draine
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Distributions of electric fields in two-dimensional arrays of gold nanodisks on Si3N4 membranes are modeled by use of the discrete-dipole approximation as a function of nanodisk diameter (20 nm to 50 nm), height (10 nm to 100 nm), ratio of the array spacing to diameter (1.3 to 4.7), and angle of incident light. The primary focus is on fields in a plane near the circular gold/vacuum interface with light of 532 nm wavelength incident through the membrane, a configuration that is particularly relevant to potential applications in plasmon-mediated Brillouin light scattering, nanolithography, and photovoltaics. The height/diameter ratio for maximum intensities over this plane is between 0.7 and 1.5 and not strongly dependent on the spacing for a given angle. The average intensity increases with decreasing array spacing and incident angle relative to the substrate normal. This dependence is attributed primarily to a combination of fractional coverage area of the gold and increased excitation of a dipolar contribution to the fields. The incident light at 532 nm simultaneously excites dipolar and quadrupolar surface-plasmon modes. Because the quadrupolar mode has a peak close to 532 nm, its excited fields are approximately out of phase with the incident light.

Paper Details

Date Published: 26 August 2008
PDF: 11 pages
Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70321S (26 August 2008); doi: 10.1117/12.795608
Show Author Affiliations
W. L. Johnson, National Institute of Standards and Technology (United States)
S. A. Kim, National Institute of Standards and Technology (United States)
Z. N. Utegulov, Univ. of Nebraska, Lincoln (United States)
B. T. Draine, Princeton Univ. (United States)


Published in SPIE Proceedings Vol. 7032:
Plasmonics: Metallic Nanostructures and Their Optical Properties VI
Mark I. Stockman, Editor(s)

© SPIE. Terms of Use
Back to Top