Efficiency of local surface plasmon polariton excitation on ridges

I. P. Radko, S. I. Bozhevolnyi, G. Brucoli, L. Martín-Moreno, F. J. García-Vidal, and A. Boltasseva
Phys. Rev. B 78, 115115 – Published 19 September 2008

Abstract

The issue of efficient local coupling of light into surface plasmon polariton (SPP) modes is an important concern in miniaturization of plasmonic components. Here we present experimental and numerical investigations of efficiency of local SPP excitation on gold ridges of rectangular profile positioned on a gold film. The excitation is accomplished by illuminating the metal surface normally with a focused laser beam. Wavelength dependence and dependence of the efficiency on geometrical parameters of ridges are examined. Using leakage radiation microscopy, the efficiency of 20% is demonstrated experimentally. Numerical simulations based on Green’s tensor approach are in good agreement with the experiment and allow suggesting an optimization of parameters for improving the efficiency of SPP excitation.

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  • Received 3 June 2008

DOI:https://doi.org/10.1103/PhysRevB.78.115115

©2008 American Physical Society

Authors & Affiliations

I. P. Radko1,*, S. I. Bozhevolnyi2,†, G. Brucoli3, L. Martín-Moreno3, F. J. García-Vidal4, and A. Boltasseva5

  • 1Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220 Aalborg Øst, Denmark
  • 2Institute of Sensors, Signals and Electrotechnics, University of Southern Denmark, Niels Bohrs Allé 1, DK-5230 Odense M, Denmark
  • 3Departamento de Fisica de la Materia Condensada-ICMA, Universidad de Zaragoza, E-50009 Zaragoza, Spain
  • 4Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
  • 5Department of Photonics Engineering, Technical University of Denmark, Building 345v, DK-2800 Kongens Lyngby, Denmark

  • *ilya@nano.aau.dk
  • Also at Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220 Aalborg Øst, Denmark.

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Issue

Vol. 78, Iss. 11 — 15 September 2008

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