Near-field observation of surface plasmon polaritons launched by V-shaped nanorods on a gold surface

By scanning near-field optical microscopy, we study the propagation of surface waves created by V-shaped nanorods deposited on a gold thin film. The nanorods launch surface plasmon polaritons that interfere with the incident light, producing interference patterns. The angle of the V-shaped rods vari...

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Bibliographic Details
Published in:Applied optics (2004) 2015-11, Vol.54 (31), p.9326-9330
Main Authors: Billot, L, Mortier, M, Aigouy, L
Format: Article
Language:English
Subjects:
Gold
Mathematical models
Nanorods
Plasmons
Polaritons
Rods
Surface waves
Wave propagation
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Summary:By scanning near-field optical microscopy, we study the propagation of surface waves created by V-shaped nanorods deposited on a gold thin film. The nanorods launch surface plasmon polaritons that interfere with the incident light, producing interference patterns. The angle of the V-shaped rods varies from 110° to 180° (straight rod). We observe that the near-field distribution strongly depends on the angle of the V. For angles close to straight rods, a hot spot is visible, whereas for a narrower angle, the surface plasmon waves are launched in specific directions. The experimental results are in good qualitative agreement with numerical simulations performed with a simple analytical model that considers the rods as a sum of isolated surface plasmon sources.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.009326