title: Near-Field Infrared Pump-Probe Imaging of Surface Phonon Coupling in Boron Nitride Nanotubes.
abstract: Surface phonon modes are lattice vibrational modes of a solid surface. Two common surface modes, called longitudinal and transverse optical modes, exhibit lattice vibration along or perpendicular to the direction of the wave. We report a two-color, infrared pump-infrared probe technique based on scattering type near-field optical microscopy (s-SNOM) to spatially resolve coupling between surface phonon modes. Spatially varying couplings between the longitudinal optical and surface phonon polariton modes of boron nitride nanotubes are observed, and a simple model is proposed.
authors.affiliation: Department of Chemistry, University of Toronto , Toronto, Ontario M5S 3H6, Canada.
authors.forename: Leonid
authors.initials: L
authors.lastname: Gilburd
authors.affiliation: Department of Chemistry, University of Toronto , Toronto, Ontario M5S 3H6, Canada.|Department of Chemistry, Lehigh University , 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States.
authors.forename: Xiaoji G
authors.initials: XG
authors.lastname: Xu
authors.affiliation: National Institute for Materials Science (NIMS) , Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Bando
authors.affiliation: National Institute for Materials Science (NIMS) , Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Dmitri
authors.initials: D
authors.lastname: Golberg
authors.affiliation: Department of Chemistry, University of Toronto , Toronto, Ontario M5S 3H6, Canada.
authors.forename: Gilbert C
authors.initials: GC
authors.lastname: Walker