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Metallic nanoparticle chains on dielectric waveguides: coupled and uncoupled situations compared
Optics Express
|October 24, 2013
Summary
Metallic nanoparticle chains exhibit distinct optical behaviors based on inter-particle distance. Localized surface plasmon excitation leads to waveguide or Bragg grating effects, with potential for coexistence at intermediate distances.
Area of Science:
- Plasmonics
- Nanophotonics
- Waveguide Optics
Background:
- Metallic nanoparticles (MNPs) support localized surface plasmons (LSPs).
- Coupling between MNPs influences optical properties.
- Waveguides are crucial for light manipulation.
Purpose of the Study:
- Investigate optical behaviors of MNP chains.
- Analyze the effect of inter-particle distance on LSP coupling.
- Understand MNP chain functionality as optical components.
Main Methods:
- Finite difference time domain (FDTD) calculations.
- Optical power transmission measurements.
- Excitation via silicon waveguide fundamental TE mode.
Main Results:
- Observed three distinct optical behaviors based on inter-particle distance.
- Short distances: dipolar coupling, MNP chain acts as a waveguide.
- Long distances: uncoupled nanoparticles, MNP chain acts as a LSP Bragg grating.
- Intermediate distances: coexistence of coupling and Bragg reflection within a narrow wavelength range.
Conclusions:
- Inter-particle distance is a critical parameter for controlling MNP chain optical properties.
- MNP chains can function as waveguides or LSP Bragg gratings.
- Coexisting behaviors offer possibilities for complex optical device design.
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