title: Serial Raman spectroscopy of particles trapped on a waveguide.
abstract: We demonstrate that Raman spectroscopy can be used to characterize and identify particles that are trapped and propelled along optical waveguides. To accomplish this, microscopic particles on a waveguide are moved along the waveguide and then individually addressed by a focused laser beam to obtain their characteristic Raman signature within 1 second acquisition time. The spectrum is used to distinguish between glass and polystyrene particles. After the characterization, the particles continue to be propelled along the straight waveguide. Alternatively, a waveguide loop with a gap is also investigated, and in this case particles are held in the gap for characterization before they are released.
authors.affiliation: Department of Physics and Technology, University of Tromsø, 9037 Tromsø, Norway.
authors.forename: Pål
authors.initials: P
authors.lastname: Løvhaugen
authors.forename: Balpreet Singh
authors.initials: BS
authors.lastname: Ahluwalia
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Huser
authors.forename: Olav Gaute
authors.initials: OG
authors.lastname: Hellesø
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D052898:Optical Tweezers; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*