Interference of locally excited surface plasmons

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364036· OSTI ID:450256

Novotny, L ^[1]; Hecht, B; Pohl, D W ^[2]

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1. Swiss Federal Institute of Technology, ETH Zuerich, CH-8092 Zuerich (Switzerland)
2. IBM Research Division, Zurich Research Laboratory, CH-8803 Rueschlikon (Switzerland)

Surface plasmon interactions on a finite silver layer are theoretically investigated using a coupled dipole formalism. The studied system consists of several protruding particles located on the surface of the layer that are scanned with an optical probe. An optical scan-image of the silver surface is obtained by assigning the recorded far-field radiation to the momentary position of the optical probe. Both, probe and protrusions are considered as single dipolar particles. Interferences of the locally excited surface plasmons can be recorded by detecting the radiation emitted into the lower half-space at angles beyond the critical angle of total internal reflection (forbidden light). The resulting scan images show excellent agreement with recent experimental measurements. The theory of the coupled dipole formalism using Green`s functions of a layered reference system is outlined and electromagnetic properties of surface plasmons are discussed. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 450256
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DIPOLES
GREEN FUNCTION
IMAGES
INTERFERENCE
LAYERS
PLASMONS
SILVER
SOLID-STATE PLASMA
SURFACE PROPERTIES