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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 8 — Apr. 14, 2008
  • pp: 5609–5616

Shape effects in the localized surface plasmon resonance of single nanoholes in thin metal films

B. Sepúlveda, Y. Alaverdyan, J. Alegret, M. Käll, and P. Johansson  »View Author Affiliations

Optics Express, Vol. 16, Issue 8, pp. 5609-5616 (2008)

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We report on the polarization-dependent optical response of elongated nanoholes in optically thin gold films. We measured elastic scattering spectra of spatially isolated ellipsoidal nanoholes with varying aspect ratio and compared the results to electrodynamic simulations. Both experiments and theory show that the plasmon mode that is polarized parallel to the short axis of the ellipsoidal hole red-shifts with increasing aspect ratio. This behavior is completely opposite to the case of elongated metal particles. We present a simple analytical model that qualitatively explains the observations in terms of the different orientations of the induced dipole moments in holes and particles.

© 2008 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics

ToC Category:
Optics at Surfaces

Original Manuscript: January 15, 2008
Revised Manuscript: March 27, 2008
Manuscript Accepted: March 29, 2008
Published: April 7, 2008

Virtual Issues
Vol. 3, Iss. 5 Virtual Journal for Biomedical Optics

B. Sepúlveda, Y. Alaverdyan, J. Alegret, M. Käll, and P. Johansson, "Shape effects in the localized surface plasmon resonance of single nanoholes in thin metal films," Opt. Express 16, 5609-5616 (2008)

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