Volume 69, Number 4, February 2005
|Page(s)||538 - 543|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||19 January 2005|
Optical near-field of multipolar plasmons of rod-shaped gold nanoparticles
Institute for Experimental Physics and Erwin Schrödinger Institute for Nanoscale Research, Karl-Franzens-University Graz - A-8010 Graz, Austria
2 Department of Physics, Indiana University - Bloomington, IN 47405, USA
Accepted: 10 December 2004
We report on near-field measurements and calculations of the optical intensity close to rod-shaped gold nanoparticles excited at a multipolar plasmon resonance. Our results reveal a distinct optical near-field pattern and show that multipolar plasmon excitation of single nanoparticles can be imaged in the near-field. The observed optical near-field patterns can be understood in a model of standing plasmon waves.
PACS: 42.25.Hz – Wave optics: Interference / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.67.Bf – Optical properties of bulk materials and thin films: Nanocrystals and nanoparticles
© EDP Sciences, 2005
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