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Surface phonon coupling within boron nitride resolved by a novel near-field infrared pump-probe imaging technique
Author(s): Leonid Gilburd; Xiaoji G. Xu; Sissi de Beer; Yoshio Bando; Dmitri Golberg; Gilbert C. Walker
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Paper Abstract

The excitation of surface phonon-polariton (SPhP) modes in polar materials using scattering type near-field optical microscopy (s-SNOM) has recently become an area of interest because of its potential for application as naturally occurring meta-materials and in low-loss energy transfer. Within this area, hexagonal boron nitride (h-BN) and boron nitride nanotubes (BNNTs) are the primary structures under investigation. Here we present pump-probe continuous wave (CW) scattering-type scanning near-field optical microscopy (s-SNOM) - a novel two color pump-probe infrared technique which uses two continuous wave tunable light sources and is based on s-SNOM. The technique allows us to spatially resolve coupling of the longitudinal optical and surface phonon polariton modes in BNNTs. However, no similar coupling is observed in two-dimensional h-BN crystals.

Paper Details

Date Published: 11 October 2016
PDF: 7 pages
Proc. SPIE 9925, Nanoimaging and Nanospectroscopy IV, 99250L (11 October 2016); doi: 10.1117/12.2237901
Show Author Affiliations
Leonid Gilburd, Univ. of Toronto (Canada)
Xiaoji G. Xu, Univ. of Toronto (Canada)
Lehigh Univ. (United States)
Sissi de Beer, Univ. of Toronto (Canada)
Univ. of Twente (Netherlands)
Yoshio Bando, National Institute for Materials Science (Japan)
Dmitri Golberg, National Institute for Materials Science (Japan)
Gilbert C. Walker, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 9925:
Nanoimaging and Nanospectroscopy IV
Prabhat Verma; Alexander Egner, Editor(s)

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