Far-field radially polarized focal spot from plasmonic spiral structure combined with central aperture antenna.

ABSTRACT: Manipulation of a vector micro-beam with an optical antenna has significant potentials for nano-optical technology applications including bio-optics, optical fabrication, and quantum information processing. We have designed and demonstrated a central aperture antenna within an Archimedean spiral that extracts the bonding plasmonic field from a surface to produce a new vector focal spot in far-field. The properties of this vector focal field are revealed by confocal microscopy and theoretical simulations. The pattern, polarization and phase of the focal field are determined by the incident light and by the chirality of the Archimedean spiral. For incident light with right-handed circular polarization, the left-handed spiral (one-order chirality) outputs a micro-radially polarized focal fiel

SUBMITTER: Mao L 

PROVIDER: S-EPMC4806319 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature