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Proceedings Paper

Theoretical analysis of surface-plasmon-polariton resonators in free space and close to an interface
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Paper Abstract

Surface-plasmon-polariton (SPP) resonators consisting of metal strips in free space, and gap plasmon polariton resonators consisting of a metal strip close to either a block of metal or a metal surface, are studied as optical resonators. The analysis is performed using the Green's function surface integral equation method. For strips in free space, we show how the scattering resonances can be understood, by thinking of the strips as optical resonators for short-range SPPs. The two gap resonator configurations, strip-block and strip-surface, have different structure terminations as the width of the strip and the block are identical whereas the surface is infinite. In the strip-surface configuration, the scattering resonances are broader and red-shifted, compared to the strip-block configuration. This is explained as a consequence of the effective length of the resonator being larger in the strip-surface configuration. By varying the gap size, we study the transition from a SPP resonator to a gap plasmon polariton resonator. In the strip-surface configuration, light can be scattered into both out-of-plane propagating waves and into SPPs that propagate along the surface. For small gaps of a few tens of nanometers, a large enhancement in the scattering cross section is seen due to strong scattering into SPPs.

Paper Details

Date Published: 23 April 2008
PDF: 12 pages
Proc. SPIE 6988, Nanophotonics II, 69881N (23 April 2008); doi: 10.1117/12.780478
Show Author Affiliations
Jesper Jung, Aalborg Univ. (Denmark)
Thomas Søndergaard, Aalborg Univ. (Denmark)

Published in SPIE Proceedings Vol. 6988:
Nanophotonics II
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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