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Schematics for the right-handed helical Ag nanostructure and the definition of the incident polarization directions used in the DDA calculations.
(Color online) Calculated extinction spectra for Ag helical nanostructures with different helix radii (a) and (b) .
(Color online) -field enhancement distributions of helix with (a) polarization and (b) polarization incidence . The oscillation modes of the electrons are illustrated below the -field distributions.
(Color online) -field enhancement distributions for polarized incident light at the main plasmon peak wavelength for helixes with (a) and ; and (b) and .
(Color online) -field enhancement distributions for the left-handed circular polarization incidence: (a) and ; (b) and .
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