Surface plasmons

Lukas Novotny; Bert Hecht

doi:10.1017/CBO9780511794193.014

12 - Surface plasmons

Published online by Cambridge University Press: 05 November 2012

Lukas Novotny and

Bert Hecht

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Lukas Novotny: Affiliation:
University of Rochester, New York and ETH Zürich, Switzerland
Bert Hecht: Affiliation:
Julius-Maximilians-Universität Würzburg, Germany

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Summary

The interaction of metals with electromagnetic radiation is largely dictated by their free conduction electrons. According to the Drude model, the free electrons oscillate 180° out of phase relative to the driving electric field. As a consequence, most metals possess a negative dielectric constant at optical frequencies, which causes, for example, a very high reflectivity. Furthermore, at optical frequencies the metal's free-electron gas can sustain surface and volume charge-density oscillations, called plasmons, with distinct resonance frequencies. The existence of plasmons is characteristic of the interaction of metal nanostructures with light at optical frequencies. Similar behavior cannot be simply reproduced in other spectral ranges using the scale invariance of Maxwell's equations since the material parameters change considerably with frequency. Specifically, this means that model experiments with, for instance, microwaves and correspondingly larger metal structures cannot replace experiments with metal nanostructures at optical frequencies.

The surface charge-density oscillations associated with surface plasmons at the interface between a metal and a dielectric can give rise to strongly enhanced optical near-fields, which are spatially confined near the metal surface. Similarly, if the electron gas is confined in three dimensions, as in the case of a small particle, the overall displacement of the electrons with respect to the positively charged lattice leads to a restoring force, which in turn gives rise to specific particle-plasmon resonances depending on the geometry of the particle. In particles of suitable (usually pointed) shape, localized charge accumulations that are accompanied by strongly enhanced optical fields can occur.

Type: Chapter
Information: Principles of Nano-Optics , pp. 369 - 413

DOI: https://doi.org/10.1017/CBO9780511794193.014 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2012

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