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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29646–29658

Fano interference in supported gold nanosandwiches with weakly coupled nanodisks

A. Mendoza-Galván, K. Järrendahl, A. Dmitriev, T. Pakizeh, M. Käll, and H. Arwin  »View Author Affiliations


Optics Express, Vol. 20, Issue 28, pp. 29646-29658 (2012)
http://dx.doi.org/10.1364/OE.20.029646


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Abstract

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.

© 2012 OSA

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(160.4760) Materials : Optical properties
(240.6680) Optics at surfaces : Surface plasmons
(260.2130) Physical optics : Ellipsometry and polarimetry
(160.1245) Materials : Artificially engineered materials

ToC Category:
Optics at Surfaces

History
Original Manuscript: November 1, 2012
Revised Manuscript: November 28, 2012
Manuscript Accepted: November 28, 2012
Published: December 20, 2012

Virtual Issues
Vol. 8, Iss. 1 Virtual Journal for Biomedical Optics

Citation
A. Mendoza-Galván, K. Järrendahl, A. Dmitriev, T. Pakizeh, M. Käll, and H. Arwin, "Fano interference in supported gold nanosandwiches with weakly coupled nanodisks," Opt. Express 20, 29646-29658 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-28-29646


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