Optical response of supported gold nanodisks
Artikel i vetenskaplig tidskrift, 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.

Författare

A. Mendoza-Galvan

Linköpings universitet

Centro de Investigacion y de Estudios Avanzados (CINVESTAV)

K. Järrendahl

Linköpings universitet

Alexander Dmitriev

Chalmers, Teknisk fysik, Bionanofotonik

Tavakol Pakizeh

K. N. Toosi University of Technology

Mikael Käll

Chalmers, Teknisk fysik, Bionanofotonik

H Arwin

Linköpings universitet

Optics Express

1094-4087 (ISSN)

Vol. 19 13 12093-12107

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Fundament

Grundläggande vetenskaper

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1364/OE.19.012093