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Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides
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Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides
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Journal Article
Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides
2003
Overview
Achieving control of light-material interactions for photonic device applications at nanoscale dimensions will require structures that guide electromagnetic energy with a lateral mode confinement below the diffraction limit of light. This cannot be achieved by using conventional waveguides
1
or photonic crystals
2
. It has been suggested that electromagnetic energy can be guided below the diffraction limit along chains of closely spaced metal nanoparticles
3
,
4
that convert the optical mode into non-radiating surface plasmons
5
. A variety of methods such as electron beam lithography
6
and self-assembly
7
have been used to construct metal nanoparticle plasmon waveguides. However, all investigations of the optical properties of these waveguides have so far been confined to collective excitations
8
,
9
,
10
, and direct experimental evidence for energy transport along plasmon waveguides has proved elusive. Here we present observations of electromagnetic energy transport from a localized subwavelength source to a localized detector over distances of about 0.5 μm in plasmon waveguides consisting of closely spaced silver rods. The waveguides are excited by the tip of a near-field scanning optical microscope, and energy transport is probed by using fluorescent nanospheres.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Chemistry and Materials Science
/ Crystals
/ Electromagnetic Phenomena - instrumentation
/ Electromagnetic Phenomena - methods
/ Energy
/ letter
/ Materials Testing - instrumentation
/ Metals
/ Microscopy, Electron, Scanning - methods
/ Microscopy, Fluorescence - methods
/ Nanotechnology - instrumentation
/ Optical and Electronic Materials
/ Silver
/ Surface Plasmon Resonance - instrumentation
