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Fano interference in supported gold nanosandwiches with weakly coupled nanodisks

A. Mendoza-Galvan ; K. Jarrendahl ; Alexandre Dmitriev (Institutionen för teknisk fysik, Bionanofotonik) ; T. Pakizeh ; Mikael Käll (Institutionen för teknisk fysik, Bionanofotonik) ; H. Arwin
Optics Express (1094-4087). Vol. 20 (2012), 28, p. 29646-29658.
[Artikel, refereegranskad vetenskaplig]

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 x 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.

Nyckelord: optical-properties, metamaterials, resonances, nanostructures, asymmetry, plasmons, films, shape

Denna post skapades 2013-03-28. Senast ändrad 2013-04-02.
CPL Pubid: 175149


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)



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