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One-dimensional coupling of gold nanoparticle plasmons in self-assembled ring superstructures
Wei-Shun Chang1, Liane S Slaughter, Bishnu P Khanal
1Department of Chemistry, Rice University, Houston, Texas 77005, USA.
Nano Letters
|February 6, 2009
Summary
Ordered gold nanoparticles in rings exhibit tunable plasmon coupling. This collective behavior, independent of ring size, mimics nanowire properties and offers potential for novel plasmonic devices.
Area of Science:
- Nanotechnology
- Materials Science
- Optics
Background:
- Collective surface plasmon resonances in metal nanoparticle assemblies are tunable via interparticle distance.
- Understanding plasmon coupling is crucial for designing advanced optical materials.
Purpose of the Study:
- To investigate the surface plasmon scattering of gold nanoparticles self-assembled into close-packed rings.
- To explore the influence of nanoparticle arrangement and ring curvature on plasmon coupling.
Main Methods:
- Utilized single-particle dark-field scattering spectroscopy to analyze plasmon resonances.
- Employed scanning electron microscopy to correlate optical properties with individual ring structures.
Main Results:
- Observed strong near-field coupling between adjacent gold nanoparticles within the rings.
- Identified red-shifted multipolar plasmon modes polarized along the ring circumference.
- Demonstrated that plasmon coupling is independent of ring curvature and local arrangement.
Conclusions:
- Self-assembled gold nanoparticle rings exhibit long-range collective plasmonic properties.
- These properties are comparable to those of metallic nanowires.
- The findings suggest potential applications in one-dimensional plasmonic systems.
