Enhancement of Chiral Fields by Geometrically Chiral Structures
It is expected that geometrically chiral plasmonic nanostructures can enhance the intrinsic optical chirality of circularly polarized light. Therefore, we analyze the chiral near-field response of different chiral nanostructures illuminated with circularly polarized light in this chapter. We show that properly designed planar geometrically chiral nanostructures can result in a natural spatial separation of chiral near-fields with opposite handedness. Three-dimensional geometrically chiral nanostructures, on the other hand, interact strongest with one preferred handedness of the incident light and can lead to chiral hot-spots, where particularly high optical chirality occurs. Based on these findings, we provide basic design principles for chiral plasmonic near-field sources based on geometrically chiral nanostructures.
KeywordsIncident Polarization Chiral Structure Plasmonic Nanostructures Polarization Conversion Particle Plasmon
- 10.M. Schäferling, D. Dregely, M. Hentschel, H. Giessen, Tailoring enhanced optical chirality: design principles for chiral plasmonic nanostructures. Phys. Rev. X 2, 031010 (2012)Google Scholar