Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite

Patricia Gant, Foad Ghasemi, David Maeso, Carmen Munuera, Elena López-Elvira, Riccardo Frisenda, David Pérez De Lara, Gabino Rubio-Bollinger, Mar Garcia-Hernandez, Andres Castellanos-Gomez*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

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.

Original languageEnglish
Pages (from-to)2357-2362
Number of pages6
JournalBeilstein Journal of Nanotechnology
Volume8
Issue number1
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • Complex refractive index
  • Franckeite
  • Optical contrast
  • Optical identification
  • Van der Waals heterostructure

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