Nanoscale infrared imaging and spectroscopy of few-layer hexagonal boron nitride

Author:

Takamura Makoto1ORCID,Watanabe Kenji2ORCID,Taniguchi Takashi3ORCID,Taniyasu Yoshitaka1

Affiliation:

1. NTT Corporation, NTT Basic Research Laboratories, 3-1, Morinosato Wakamiya Atsugi, Kanagawa 243-0198, Japan

2. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

3. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Abstract

Nanoscale evaluation of the number of layers and boundaries in two-dimensional (2D) materials is crucial for understanding relationships between structure and property. Here, using scattering-type scanning near-field optical microscopy, we systematically studied on a nanoscale the infrared spectra and imaging of hexagonal boron nitride (h-BN), an ideal 2D insulating material. We revealed that the main factor determining the infrared amplitude changes at an optical frequency of about 1370 cm−1, corresponding to the in-plane phonon mode of h-BN. At lower frequencies, the amplitude is mainly determined by the local dielectric function of a sample and depends on the number of h-BN layers. At higher frequencies, it is affected by the phonon polariton waves of h-BN, and thus edges and grain boundaries of h-BN can be visualized due to the reflection of the waves at the boundary. The infrared spectra show a shoulder peak at higher frequencies, derived from the resonance with the phonon polaritons, in addition to a peak due to the in-plane phonon mode.

Funder

Japan Society for the Promotion of Science

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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