Tuning the nonlinear optical absorption of reduced graphene oxide by chemical reduction

Shi, Hongfei and Wang, Can and Sun, Zhipei and Zhou, Yueliang and Jin, Kuijuan and Redfern, Simon A. T. and Yang, Guozhen (2014) Tuning the nonlinear optical absorption of reduced graphene oxide by chemical reduction. Optics Express, 22 (16). p. 19375. ISSN 1094-4087 DOI 10.1364/OE.22.019375

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Official URL: http://dx.doi.org/10.1364/OE.22.019375

Abstract

Reduced graphene oxides with varying degrees of reduction have been produced by hydrazine reduction of graphene oxide. The linear and nonlinear optical properties of both graphene oxide as well as the reduced graphene oxides have been measured by single beam Z-scan measurement in the picosecond region. The results reveal both saturable absorption and two-photon absorption, strongly dependent on the intensity of the pump pulse: saturable absorption occurs at lower pump pulse intensity (~1.5 GW/cm2 saturation intensity) whereas two-photon absorption dominates at higher intensities (≥5.7 GW/cm2). Intriguingly, we find that the two-photon absorption coefficient (from 1.5 cm/GW to 4.5cm/GW) and the saturation intensity (from 1 GW/cm2 to 2 GW/cm2) vary with chemical reduction, which is ascribed to the varying concentrations of sp2 domains and sp2 clusters in the reduced graphene oxides. Our results not only provide an insight into the evolution of the nonlinear optical coefficient in reduced graphene oxide, but also suggest that chemical engineering techniques may usefully be applied to tune the nonlinear optical properties of various nano-materials, including atomically thick graphene sheets.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 03 - Mineral Sciences
99 - Other
Divisions: 03 - Mineral Sciences
99 - Other
Journal or Publication Title: Optics Express
Volume: 22
Page Range: p. 19375
Identification Number: 10.1364/OE.22.019375
Depositing User: Sarah Humbert
Date Deposited: 19 Sep 2014 17:21
Last Modified: 02 Nov 2014 00:10
URI: http://eprints.esc.cam.ac.uk/id/eprint/3130

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