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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
Published on: December 11, 2013
Coherent light scattering from semicontinuous silver nanoshells near the percolation threshold
C A Rohde1, K Hasegawa, Miriam Deutsch
1Oregon Center for Optics and Department of Physics, University of Oregon, Eugene, Oregon 97403, USA.
Physical Review Letters
|February 21, 2006
Summary
We studied silver nanoshells on silica spheres, finding their plasmon resonances can be tuned by shell geometry. This reveals new localized plasmon dynamics in the visible and delocalized plasmons in the infrared.
Area of Science:
- Nanophotonics
- Plasmonics
- Materials Science
Background:
- Semicontinuous silver nanoshells on silica spheres exhibit tunable plasmon resonances.
- Understanding their optical properties is crucial for nanophotonic applications.
Purpose of the Study:
- To measure and model the visible extinction spectra of these silver nanoshells.
- To investigate the relationship between shell geometry and plasmon resonance.
- To explore the plasmon dynamics across different spectral regimes.
Main Methods:
- Measurements of visible extinction spectra.
- Application of a modified scaling theory to model dielectric response.
- Calculation of extinction cross section using retarded Mie scattering formalism.
Main Results:
- Thin, fractal shells below the percolation threshold show geometrically tunable plasmon resonances.
- A new regime of coherently driven cluster-localized plasmons was observed in the visible spectrum.
- A crossover to homogeneous response in the infrared predicts a delocalized shell plasmon.
Conclusions:
- The study demonstrates precise control over plasmon resonances in silver nanoshells through geometric tuning.
- Unique plasmon dynamics, including localized and delocalized regimes, are supported by these spherical resonators.
- Findings offer insights into designing nanostructures for tailored optical responses.
