Bashevoy, M.V., Fedotov, V.A. and Zheludev, N.I.
The ultimate departure from geometrical optics: vortex optical field around plasmonic nanoparticle
At QEP-17 at Photon06.
04 - 07 Sep 2006.
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Here we report on the discovery of an extreme deviation from geo'metrical optics: light interacting with a metallic nanoparticle, in the proximity of its plasmon resonance, follows curly trajectories with curvatures on a subwavelength scale, creating nanoscale optical vortices. We discuss how the appearance of these vortex structures is related to resonant increases in the absorption and scattering cross-sections of the nano-objects and weather the vortex structure could provide a natural feedback mechanism, thus creating a nano-scale analog of an optical resonator.
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