11 October 2016 Surface phonon coupling within boron nitride resolved by a novel near-field infrared pump-probe imaging technique
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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.
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Leonid Gilburd, Leonid Gilburd, Xiaoji G. Xu, Xiaoji G. Xu, Sissi de Beer, Sissi de Beer, Yoshio Bando, Yoshio Bando, Dmitri Golberg, Dmitri Golberg, Gilbert C. Walker, Gilbert C. Walker, "Surface phonon coupling within boron nitride resolved by a novel near-field infrared pump-probe imaging technique", Proc. SPIE 9925, Nanoimaging and Nanospectroscopy IV, 99250L (11 October 2016); doi: 10.1117/12.2237901; https://doi.org/10.1117/12.2237901
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