title: Ultrasensitive diagnostic analysis of Au nanoparticles optically trapped in silicon photonic circuits at sub-milliwatt powers.
abstract: Silicon microcavity-based optical trapping of Au nanoparticles with diameters as small as ≈24 nm is achieved using optical powers <1 mW. By comparing measured and modeled histograms of transmission time series data obtained when a particle is trapped in the cavity, it is shown that the influence of backaction on the transmitted light dynamics alone can be used to determine the size of trapped particles with nanometer precision.
authors.affiliation: Department of Physics and Astronomy, Advanced Materials and Process Engineering Laboratory, University of British Columbia , Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: S Hamed
authors.initials: SH
authors.lastname: Mirsadeghi
authors.forename: Jeff F
authors.initials: JF
authors.lastname: Young
keywords: Au Nanoparticles; Backaction; Integrated Photonic Circuit; Optical Manipulation and Trapping; Optical Tweezers; Slot Photonic Crystal Cavity