Enhanced tunability and linewidth sharpening of plasmon resonances in hybridized metallic ring/disk nanocavities

Feng Hao, Peter Nordlander, Mathew T. Burnett, and Stefan A. Maier
Phys. Rev. B 76, 245417 – Published 18 December 2007

Abstract

Using the finite-difference time-domain method, we investigate the plasmonic mode spectrum of a metallic nanostructure consisting of a concentric arrangement of a solid disk and a surrounding ring. We demonstrate that the energies of the plasmon modes depend sensitively on the structural parameters of the disk and the ring. We show that the nature of the plasmon modes can be understood simply as a hybridization of individual disk and ring plasmons. This interaction results in a redshifted bonding plasmon resonance of significantly narrower linewidth and larger electromagnetic field enhancements than the parent plasmons. This highly tunable nanostructure has significant potential as a substrate for surface enhanced spectroscopies.

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  • Received 23 July 2007

DOI:https://doi.org/10.1103/PhysRevB.76.245417

©2007 American Physical Society

Authors & Affiliations

Feng Hao and Peter Nordlander*

  • Laboratory for Nanophotonics, Department of Physics and Astronomy, M. S. 61, Rice University, Houston, Texas 77005-1892, USA

Mathew T. Burnett

  • Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom

Stefan A. Maier

  • Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom and Experimental Solid State Group, Physics Department, Imperial College, London SW7 2AZ, United Kingdom‡

  • *nordland@rice.edu
  • s.maier@imperial.ac.uk
  • Present address.

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Issue

Vol. 76, Iss. 24 — 15 December 2007

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