Optical response of supported gold nanodisks
Journal article, 2011

It is shown that the ellipsometric spectra of short range ordered planar arrays of gold nanodisks supported on glass substrates can be described by modeling the nanostructured arrays as uniaxial homogeneous layers with dielectric functions of the Lorentz type. However, appreciable deviations from experimental data are observed in calculated spectra of irradiance measurements. A qualitative and quantitative description of all measured spectra is obtained with a uniaxial effective medium dielectric function in which the nanodisks are modeled as oblate spheroids. Dynamic depolarization factors in the long-wavelength approximation and interaction with the substrate are considered. Similar results are obtained calculating the optical spectra using the island-film theory. Nevertheless, a small in-plane anisotropy and quadrupolar coupling effects reveal a very complex optical response of the nanostructured arrays.

Author

A. Mendoza-Galvan

Linköping University

Centro de Investigacion y de Estudios Avanzados Centro de Investigacion y de Estudios Avanzados (CINVESTAV)

K. Järrendahl

Linköping University

Alexander Dmitriev

Chalmers, Applied Physics, Bionanophotonics

Tavakol Pakizeh

K. N. Toosi University of Technology

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

H Arwin

Linköping University

Optics Express

1094-4087 (ISSN)

Vol. 19 13 12093-12107

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Materials Science

Roots

Basic sciences

Subject Categories

Atom and Molecular Physics and Optics

DOI

10.1364/OE.19.012093

More information

Latest update

2/28/2018