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Title: Measuring the complex optical conductivity of graphene by Fabry-Pérot reflectance spectroscopy [Determination of the optical index for few-layer graphene by reflectivity spectroscopy]

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep34166· OSTI ID:1360135

Here, we have experimentally studied the optical refractive index of few-layer graphene through reflection spectroscopy at visible wavelengths. A laser scanning microscope (LSM) with a coherent supercontinuum laser source measured the reflectivity of an exfoliated graphene flake on a Si/SiO2 substrate, containing monolayer, bilayer and trilayer areas, as the wavelength of the laser was varied from 545nm to 710nm. The complex refractive index of few-layer graphene, n-ik, was extracted from the reflectivity contrast to the bare substrate and the Fresnel reflection theory. Since the SiO2 thickness enters to the modeling as a parameter, it was precisely measured at the location of the sample. It was found that a common constant optical index cannot explain the wavelength-dependent reflectivity data for single-, double- and three-layer graphene simultaneously, but rather each individual few-layer graphene possesses a unique optical index whose complex values were precisely and accurately determined from the experimental data.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0012036
OSTI ID:
1360135
Journal Information:
Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Manipulating of Different-Polarized Reflected Waves with Graphene-based Plasmonic Metasurfaces in Terahertz Regime journal September 2017
Vapour sensing properties of graphene-covered gold nanoparticles journal January 2019
Dielectric resonator method for determining gap symmetry of superconductors through anisotropic nonlinear Meissner effect journal April 2019
Nonlinear graphene plasmonics journal October 2017
Controlling Excitons in an Atomically Thin Membrane with a Mirror journal January 2020
Stimulated Brillouin scattering in dispersed graphene journal January 2018
Stimulated Brillouin scattering in dispersed graphene text January 2018
Controlling excitons in an atomically thin membrane with a mirror text January 2019
Dielectric Resonator Method For Determining Gap Symmetry Of Superconductors Through Anisotropic Nonlinear Meissner Effect text January 2019
Thin-suspended 2D Materials: Facile, Versatile, and Deterministic Transfer Assembly text January 2020