Infrared reduction, an efficient method to control the non-linear optical property of graphene oxide in femtosecond regime

S. Bhattacharya; R. Maiti; S. Saha; A. C. Das; S. Mondal; S. K. Ray; S. B. N. Bhaktha; P. K. Datta

doi:10.1117/12.2227328

21 April 2016 Infrared reduction, an efficient method to control the non-linear optical property of graphene oxide in femtosecond regime

S. Bhattacharya, R. Maiti, S. Saha, A. C. Das, S. Mondal, S. K. Ray, S. B. N. Bhaktha, P. K. Datta

Author Affiliations +

Proceedings Volume 9884, Nanophotonics VI; 98842L (2016) https://doi.org/10.1117/12.2227328
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

Graphene Oxide (GO) has been prepared by modified Hummers method and it has been reduced using an IR bulb (800-2000 nm). Both as grown GO and reduced graphene oxide (RGO) have been characterized using Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Raman spectra shows well documented Dband and G-band for both the samples while blue shift of G-band confirms chemical functionalization of graphene with different oxygen functional group. The XPS result shows that the as-prepared GO contains 52% of sp² hybridized carbon due to the C=C bonds and 33% of carbon atoms due to the C-O bonds. As for RGO, increment of the atomic % of the sp² hybridized carbon atom to 83% and rapid decrease in atomic % of C=O bonds confirm an efficient reduction with infrared radiation. UV-Visible absorption spectrum also confirms increment of conjugation with increased reduction. Non-linear optical properties of both GO and RGO are measured using single beam open aperture Z-Scan technique in femtosecond regime. Intensity dependent nonlinear phenomena are observed. Depending upon the intensity, both saturable absorption and two photon absorption contribute to the non-linearity of both the samples. Saturation dominates at low intensity (~ 127 GW/cm²) while two photon absorption become prominent at higher intensities (from 217 GW/cm² to 302 GW/cm²). We have calculated the two-photon absorption co-efficient and saturation intensity for both the samples. The value of two photon absorption co-efficient (for GO~ 0.0022-0.0037 cm/GW and for RGO~ 0.0128-0.0143 cm/GW) and the saturation intensity (for GO~57 GW/cm² and for RGO~ 194GW/cm²) is increased with reduction. Increase in two photon absorption coefficient with increasing intensity can also suggest that there may be multi-photon absorption is taking place.

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S. Bhattacharya, R. Maiti, S. Saha, A. C. Das, S. Mondal, S. K. Ray, S. B. N. Bhaktha, and P. K. Datta "Infrared reduction, an efficient method to control the non-linear optical property of graphene oxide in femtosecond regime", Proc. SPIE 9884, Nanophotonics VI, 98842L (21 April 2016); https://doi.org/10.1117/12.2227328

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