title: The properties of gold nanospheres studied with dark field optical trapping.
abstract: We demonstrate trapping and characterization of multiple gold nanospheres with a setup composed of dark field imaging and optical tweezers. The number of trapped nanospheres is quantified by the overall dark-field scattering intensity. The spectra of the scattering intensity show that there is no interparticle coupling among trapped nanospheres when the density of nanospheres in the trap is low enough (less than 10 particles), while the density of nanosphere increases the interparticle coupling of nanospheres becomes obvious. In addition, the trapping potential of a single gold nanosphere is obtained by trapping an ensemble of gold nanospheres.
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Ling
authors.forename: Lu
authors.initials: L
authors.lastname: Huang
authors.forename: Jinxin
authors.initials: J
authors.lastname: Fu
authors.forename: Honglian
authors.initials: H
authors.lastname: Guo
authors.forename: Jiafang
authors.initials: J
authors.lastname: Li
authors.forename: H Daniel
authors.initials: HD
authors.lastname: Ou-Yang
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Li