Schematics for the right-handed helical nanostructure and the multiring structure. The definitions of the incident polarization directions used in the DDA calculations are also shown.
Extinction spectra for (a) Ag helical nanostructures and (b) multiring nanostructure under LP incidence. The field enhancement distribution contours of (c) a helical nanostructure with at and (d) a multirings with at under LP incidence.
Extinction spectra for (a) Ag helical nanostructures and (b) multiring nanostructures under TP incidence; and the field enhancement distribution contours of helical nanostructure with at under TP incidence.
Extinction spectra for Ag helical nanostructures under XP incidence.
Extinction spectra for Ag helical nanostructure of : (a) polarization dependent spectra, (b) polar plots of at and , respectively; and (c) polar plot for weighted average plasmon peaks.
field enhancement contours of multiring nanostructures with at under different incident polarizations: (a) XP and (b) YP.
Extinction spectra for Ag helical nanostructures under different polarization incidences: (a) RHCP; (b) LHCP; and (c) extinction spectra of helix under circularly polarized incidence and the fitting curves using Eq. (2).
field enhancement contours of the helix under different circular polarizations and wavelength: (a) RHCP and ; (b) LHCP and for .
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