Observation of coupling between surface plasmons in index-matched hole arrays

Michiel J. A. de Dood, Eduard F. C. Driessen, Daniël Stolwijk, and Martin P. van Exter
Phys. Rev. B 77, 115437 – Published 21 March 2008

Abstract

We measured the transmission of a large array of holes in an optically thick gold film, immersed in liquids of different refractive indices. For a large difference in refractive index between the substrate and the liquid (Δn0.05), the transmission spectra contain separate resonances, due to surface plasmons propagating on each of the metal-to-dielectric interfaces. When the index difference is reduced we observe an avoided crossing between a strong low-energy mode and a weak high-energy mode. The low-energy mode becomes broader and gains amplitude at the expense of the high-energy mode. For an index-matched array, a single broad resonance remains. These observations provide direct evidence that the two surface plasmon modes on both sides of the interface are coupled.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 12 November 2007

DOI:https://doi.org/10.1103/PhysRevB.77.115437

©2008 American Physical Society

Authors & Affiliations

Michiel J. A. de Dood, Eduard F. C. Driessen, Daniël Stolwijk, and Martin P. van Exter

  • Huygens Laboratory, P.O. Box 9504, 2300 RA Leiden, The Netherlands

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 77, Iss. 11 — 15 March 2008

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×