title: Mapping 3D focal intensity exposes the stable trapping positions of single nanoparticles.
abstract: The photonic interactions between a focused Gaussian laser beam and a nanoscopic particle are highly dependent on exact particle location and focal intensity distribution. So far, the 3D focal intensity distribution and the preferred position of a nanoparticle confined within the focal region were only theoretically predicted. Here, we directly map the three-dimensional focal intensity distribution, quantify stable trapping positions, and prove that certain sizes of nanoparticles stably trap in front of the focus.
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100, Denmark.
authors.forename: Anders
authors.initials: A
authors.lastname: Kyrsting
authors.forename: Poul M
authors.initials: PM
authors.lastname: Bendix
authors.forename: Lene B
authors.initials: LB
authors.lastname: Oddershede