title: Photothermal heterodyne holography of gold nanoparticles.
abstract: We report a method based on heterodyne numerical holography associated to photothermal excitation for full field and three-dimensional localisation of metallic nanoparticles. A modulated pump laser (lambda = 532 nm) heats several particles, creating local refractive index changes. This modulation is detected using a probe and a local oscillator beam (lambda = 785 nm), frequency-shifted to create a hologram beating at low frequency. Tens of particles, down to diameters of 10 nm, can be localised simultaneously and selectively in three dimensions with near- diffraction resolution by a numerical reconstruction of a single hologram acquired in 5 s.
authors.affiliation: Ecole Supérieure de Physique et de Chimie Industrielles ParisTech, Institut Langevin CNRS UMR 7587 and LPEM CNRS UPR A0005, 10 rue Vauquelin, Paris Cedex 05, France.
authors.forename: E
authors.initials: E
authors.lastname: Absil
authors.forename: G
authors.initials: G
authors.lastname: Tessier
authors.forename: M
authors.initials: M
authors.lastname: Gross
authors.forename: M
authors.initials: M
authors.lastname: Atlan
authors.forename: N
authors.initials: N
authors.lastname: Warnasooriya
authors.forename: S
authors.initials: S
authors.lastname: Suck
authors.forename: M
authors.initials: M
authors.lastname: Coppey-Moisan
authors.forename: D
authors.initials: D
authors.lastname: Fournier
mesh_terms: D006046:Gold / Q000737:chemistry*; D006696:Holography / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010783:Photometry / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D013817:Thermography / Q000379:methods*
chemical_list: D006046:Gold