Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY(2017)
摘要
We study mechanically exfoliated nanosheets of franckeite by quantitative optical microscopy. The analysis of transmission-mode and epi-illumination-mode optical microscopy images provides a rapid method to estimate the thickness of the exfoliated flakes at first glance. A quantitative analysis of the optical contrast spectra by means of micro-reflectance allows one to determine the refractive index of franckeite over a broad range of the visible spectrum through a fit of the acquired spectra to a model based on the Fresnel law.
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关键词
complex refractive index,franckeite,optical contrast,optical identification,van der Waals heterostructure
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