Near-Field Infrared Pump–Probe Imaging of Surface Phonon Coupling in Boron Nitride Nanotubes

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• 作者：Leonid Gilburd ; Xiaoji G. Xu ; Yoshio Bando ; Dmitri Golberg ; Gilbert C. Walker
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：January 21, 2016
• 年：2016
• 卷：7
• 期：2
• 页码：289-294
• 全文大小：533K
• ISSN：1948-7185

文摘

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.