title: Expanding the optical trapping range of gold nanoparticles.
abstract: We demonstrate stable three-dimensional (3D) single-beam optical trapping of gold nanoparticles with diameters between 18 and 254 nm. Three-dimensional power spectral analysis reveals that, for nanoparticles with diameters less than 100 nm, the trap stiffness is proportional to the volume of the particle. For larger particles, the trap stiffness still increases with size, however, less steeply. Finally, we provide numbers for the largest forces exertable on gold nanoparticles.
authors.affiliation: Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark.
authors.forename: Poul Martin
authors.initials: PM
authors.lastname: Hansen
authors.forename: Vikram Kjøller
authors.initials: VK
authors.lastname: Bhatia
authors.forename: Niels
authors.initials: N
authors.lastname: Harrit
authors.forename: Lene
authors.initials: L
authors.lastname: Oddershede