Three-dimensional, arbitrary orientation of focal polarization.

Institut für Angewandte Photophysik, Technische Universität Dresden, 01069 Dresden, Germany.
Applied Optics (Impact Factor: 1.69). 08/2010; 49(23):4479-82. DOI: 10.1364/AO.49.004479
Source: PubMed

ABSTRACT We demonstrate a simple setup for generating a three-dimensional arbitrary orientation of the polarization vector in a laser focus. The key component is the superposition of a linearly and a radially polarized laser beam, which both can be controlled individually in intensity and relative phase. We exemplify the usefulness of this setup by determining the spatial orientation of a single silver nanorod in three-dimensional space by recording the angle-variable backscattered light intensity.