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Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering.
Optics Express
|June 9, 2009
Summary
Researchers mapped nanostructured arrays, distinguishing diffraction and plasmonic features. They observed localized plasmons with flattened energy dispersions, crucial for surface-enhanced Raman scattering (SERS) applications.
Area of Science:
- Nanophotonics and Plasmonics
- Materials Science
Background:
- Nanostructured materials offer unique optical properties.
- Understanding plasmonic behavior in these structures is key for advanced applications.
Purpose of the Study:
- To demonstrate comprehensive reflectivity mapping of angular dispersion in nanostructured arrays.
- To distinguish and characterize diffraction and plasmonic features in dielectric and metallic arrays.
- To investigate the energy scaling and confinement of localized plasmons.
Main Methods:
- Fabrication of nanostructured arrays with inverted pyramidal pits.
- Comprehensive reflectivity mapping.
- Comparison of dielectric and metallic nanostructures.
- 2D finite-difference time-domain (FDTD) simulations.
Main Results:
- Successfully distinguished diffraction and plasmonic features.
- Observed localized plasmons with flattened energy dispersions.
- Demonstrated energy scaling of localized plasmons with varying pit dimensions.
- Validated a simple model of surface plasmon confinement on pit sidewalls.
Conclusions:
- Localized plasmons in these nanostructures exhibit tuneable properties.
- The observed plasmons are responsible for surface-enhanced Raman scattering (SERS).
- These findings pave the way for advanced SERS substrates with broad applications.
