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Optical response of supported gold nanodisks

A. Mendoza-Galvan ; K. Järrendahl ; Alexandre Dmitriev (Institutionen för teknisk fysik, Bionanofotonik) ; Tavakol Pakizeh ; Mikael Käll (Institutionen för teknisk fysik, Bionanofotonik) ; H. Arwin
Optics Express (1094-4087). Vol. 19 (2011), 13, p. 12093-12107.
[Artikel, refereegranskad vetenskaplig]

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.



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Denna post skapades 2011-07-24. Senast ändrad 2011-08-16.
CPL Pubid: 143594

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)

Ämnesområden

Materialvetenskap
Nanovetenskap och nanoteknik
Optik
Optisk fysik

Chalmers infrastruktur