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Plasmonic waveguide modes of film-coupled metallic nanocubes
J Britt Lassiter1, Felicia McGuire, Jack J Mock
1Department of Electrical and Computer Engineering, ‡Center for Metamaterials and Integrated Plasmonics, §Department of Biomedical Engineering, and ∥Department of Chemistry, Duke University , Durham, North Carolina 27708, United States.
Nano Letters
|November 9, 2013
Summary
This study investigates plasmonic effects in silver nanocubes over metal films. Researchers found that waveguide cavity-like modes between the nanocube and film create unique scattering properties for optical applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Metallic nanoparticles over metal films are controllable systems for studying plasmonic effects.
- The film-coupled nanoparticle geometry enables precise control over gap size for enhanced optical fields and quantum plasmonics.
Purpose of the Study:
- To examine the plasmon modes of a silver nanocube positioned over a silver or gold film.
- To investigate the formation of waveguide cavity-like modes and their impact on optical properties.
Main Methods:
- Experimental spectroscopy of individual nanocubes over metal films.
- Numerical simulations of the film-coupled nanocube system.
- Fabrication of systems with subnanometer precision using bottom-up approaches.
Main Results:
- Observed distinctive scattering characteristics due to waveguide cavity-like modes.
- Achieved excellent agreement between experimental spectroscopy and numerical simulations.
- Demonstrated the potential for creating controlled reflectance surfaces.
Conclusions:
- The waveguide mode description effectively explains the observed optical properties.
- Film-coupled nanocubes offer a promising platform for advanced optical applications.
- This geometry is suitable for designing surfaces with tailored reflectance.
