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.
Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite / Gant, P.; Ghasemi, F.; Maeso, D.; Munuera, C.; Lopez-Elvira, E.; Frisenda, R.; De Lara, D. P.; Rubio-Bollinger, G.; Garcia-Hernandez, M.; Castellanos-Gomez, A.. - In: BEILSTEIN JOURNAL OF NANOTECHNOLOGY. - ISSN 2190-4286. - 8:1(2017), pp. 2357-2362. [10.3762/bjnano.8.235]
Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite
Frisenda R.;
2017
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.| File | Dimensione | Formato | |
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