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

doi:10.1016/j.optcom.2020.126535

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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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 language	English
Article number	126535
Journal	Optics Communications
Volume	481
Early online date	15 Oct 2020
DOIs	https://doi.org/10.1016/j.optcom.2020.126535
Publication status	Published - 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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title = "Direct observation of an irradiance dependent nonlinear refraction in CVD single layer graphene",

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 {\~n}I 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.",

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author = "G. Demetriou and F. Biancalana and E. Abraham and W. Ji and Y. Wang and Kar, {A. K.}",

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T1 - Direct observation of an irradiance dependent nonlinear refraction in CVD single layer graphene

AU - Demetriou, G.

AU - Biancalana, F.

AU - Abraham, E.

AU - Ji, W.

AU - Wang, Y.

AU - Kar, A. K.

PY - 2021/2/15

Y1 - 2021/2/15

N2 - 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.

AB - 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.

KW - Graphene

KW - Nonlinear optical materials

KW - Nonlinear refraction

KW - Ultrafast nonlinear optics

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DO - 10.1016/j.optcom.2020.126535

M3 - Article

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VL - 481

JO - Optics Communications

JF - Optics Communications

M1 - 126535

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

Abstract

Keywords

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