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Optical response of supported gold nanodisks
Cinvestav-IPN, Unidad Querétaro, Querétaro, Mexico.
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0003-2749-8008
Department of Applied Physics, Chalmers University of Technology, Göteborg.
Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, Tehran, Iran.
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2011 (English)In: Optics Express, ISSN 1094-4087, Vol. 19, no 13, 12093-12107 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Optical Society of America (OSA) , 2011. Vol. 19, no 13, 12093-12107 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-69850DOI: 10.1364/OE.19.012093ISI: 000292867600021OAI: diva2:433439
Available from: 2011-08-10 Created: 2011-08-08 Last updated: 2013-10-14

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