Chiral Electromagnetic Fields Generated by Arrays of Nanoslits
E Hendry, RV Mikhaylovskiy, LD Barron, M Kadodwala, TJ Davis
Nano Letters: a journal dedicated to nanoscience and nanotechnology | AMER CHEMICAL SOC | Published : 2012
Using a modal matching theory, we demonstrate the generation of short-range, chiral electromagnetic fields via the excitation of arrays of staggered nanoslits that are chiral in two dimensions. The electromagnetic near fields, which exhibit a chiral density greater than that of circularly polarized light, can enhance the chiroptical interactions in the vicinity of the nanoslits. We discuss the features of nanostructure symmetry required to obtain the chiral fields and explicitly show how these structures can give rise to detection and characterization of materials with chiral symmetry.
Awarded by Engineering and Physical Sciences Research Council
This work was supported through funding from the EPSRC. The authors thank Ian Hooper for discussion on data analysis, and Harald Giessen, Konstantin Bliokh and Mike Wiltshire for useful discussions.