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Fano interference in supported gold nanosandwiches with weakly coupled 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, Sweden.
Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, Tehran, Iran.
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2012 (English)In: Optics Express, ISSN 1094-4087, Vol. 20, no 28, 29646-29658 p.Article in journal (Refereed) Published
Abstract [en]

We studied the far-field optical response of supported gold-silica-gold nanosandwiches using spectroscopic ellipsometry, reflectance and transmittance measurements. Although transmittance data clearly shows that the gold nanodisks in the sandwich structure interact very weakly, oblique reflectance spectra of s- and p-polarized light show clearly asymmetric line-shapes of the Fano type. However, all experimental results are very well described by modeling the gold nanodisks as oblate spheroids and by employing a 2 × 2 scattering matrix formulation of the Fresnel coefficients provided by an island film theory. In particular, the Fano asymmetry can be explained in terms of interference between the scattered waves from the decoupled nanodisks in the spectral range limited by their respective plasmon resonances. We also show that the reflectance and ellipsometry spectra can be described by a three-layer system with uniaxial effective dielectric functions.

Place, publisher, year, edition, pages
2012. Vol. 20, no 28, 29646-29658 p.
Keyword [en]
Surface plasmons; Anisotropic optical materials; Artificially engineered materials; Ellipsometry and polarimetry; Optical properties.
National Category
Nano Technology
URN: urn:nbn:se:liu:diva-86702DOI: 10.1364/OE.20.029646ISI: 000314914500055OAI: diva2:580445
Knut and Alice Wallenberg Foundation

Funding Agencies|Conacyt-Mexico||Fondo Sectorial de Investigacion para la Educacion|103385|Swedish Foundation for Strategic Research|RMA08|

Available from: 2012-12-21 Created: 2012-12-21 Last updated: 2013-10-14

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