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Reflectivity measurements of gold nanostructures graded in pitch and aperture size allow investigation of localized plasmons. A simple model confirmed by simulations explains the plasmon resonances. Such arrays are highly suitable Raman scattering substrates.
We demonstrate how the enhancement of SERS is correlated to the matching of localized plasmons at the pump laser wavelength, by designing and measuring a variety of nanostructured gold surfaces, showing both tuning and reproducibility.
We demonstrate how localized plasmons on nanostructured gold surfaces can be made to have two independently tuneable resonant wavelengths using anisotropic voids. This allows double resonance conditions for scattering (such as SERS) to be obtained.
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