Direct observation of an irradiance dependent nonlinear refraction in CVD single layer graphene

G. Demetriou, F. Biancalana, E. Abraham, W. Ji, Y. Wang, A. K. Kar

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Abstract

The nonlinear optical properties of single layer graphene are studied via Z-scan. The measurements are carried out at 1045 nm with a 360 femtosecond highly stable Yb doped mode-locked fiber laser. Under laser illumination single-layer graphene exhibits both a transmittance increase due to saturable absorption and a nonlinear phase-shift due to nonlinear refraction. The nonlinear refraction measurements were carried out from 0.5 to 8 GW/cm2 revealing an expected irradiance-dependent nonlinear refraction. An effective nonlinear refractive index coefficient ñI is used to describe this and discriminate it from the conventional n2 coefficient usually measured by Z-scan. The saturation level of the nonlinear phase-shift where the nonlinear response becomes irradiance dependent is deduced from the experimental data.

Original languageEnglish
Article number126535
JournalOptics Communications
Volume481
Early online date15 Oct 2020
DOIs
Publication statusPublished - 15 Feb 2021

Keywords

  • Graphene
  • Nonlinear optical materials
  • Nonlinear refraction
  • Ultrafast nonlinear optics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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