Beilstein J. Nanotechnol.2017,8, 2357–2362, doi:10.3762/bjnano.8.235
-CSIC), E-28049, Madrid, Spain Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049, Madrid, Spain 10.3762/bjnano.8.235 Abstract 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.
Keywords: complex refractive index; franckeite; optical contrast; optical identification; van der Waals heterostructure; Introduction
Mechanical exfoliation is a very powerful technique to produce a large variety
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Figure 1:
Crystal structure of franckeite where the two different stacked layers, the SnS2-like and the PbS-l...