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Optical response of supported gold nanodisks
Cinvestav-IPN, Unidad Querétaro, Querétaro, Mexico.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad optik. Linköpings universitet, Tekniska högskolan.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.
Vise andre og tillknytning
2011 (engelsk)Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, nr 13, 12093-12107 s.Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Optical Society of America (OSA) , 2011. Vol. 19, nr 13, 12093-12107 s.
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-69850DOI: 10.1364/OE.19.012093ISI: 000292867600021OAI: oai:DiVA.org:liu-69850DiVA: diva2:433439
Tilgjengelig fra: 2011-08-10 Laget: 2011-08-08 Sist oppdatert: 2017-12-08

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