Figure 1.

(a) Schematics of a plasmonic helix with a pitch of 100 nm and a diameter of 60 nm for the excitation of enhanced chiral near-fields. Due to the chiral geometry of the helix, the chiral density can be excited even from incident linearly polarized fields, as depicted. (b) Slice plots confirming the enhanced chiral density in the interior region of the helix due to the excitation of plasmonic resonances. The results shown are for an incident wavelength $\lambda =1630$ nm. Reproduced with permission from ref. [19]. Copyright 2014 American Chemical Society.