Surface-related nonlinear optical enhancement in graphene and G/CdS nanohybrids

Baohua Zhu; Fangfang Wang; Yuzong Gu

doi:10.1117/12.2502656

25 October 2018 Surface-related nonlinear optical enhancement in graphene and G/CdS nanohybrids

Baohua Zhu, Fangfang Wang, Yuzong Gu

Proceedings Volume 10823, Nanophotonics and Micro/Nano Optics IV; 108230P (2018) https://doi.org/10.1117/12.2502656
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

In the past few years, significant progress has been made in the structure design, growth and nonlinear optical properties of graphene and graphene-based nanohybrids. The surface defects on the nanomaterials play an important role on the optical nonlinearity of graphene and graphene-based nanohybrids owing to a large surface-to-volume ratio in the nanomaterials. To investigate the correlation between surface defects and the synergistic nonlinear optical response in graphene-based nanocomposites, we attached CdS nanocrystals on the surface of graphene and prepared G/CdS nanohybrids and graphene nanosheets consisting of different oxygen-containing functional groups via chemical method, which are determined by experimental measurements of FTIR and XPS characterization. The nonlinear optical absorption and refraction of G/CdS nanohybrids under single pulse laser irradiation are enhanced 10.8 times with the concentration decrease of surface oxygen-containing groups, which might be attributed to the local field effects and synergetic effects stemming from charge transfer between the two components. Surface oxygen-containing defects tuned nonlinear optical absorption and refraction of graphene nanosheets are also investigated. Tuning the surface oxygencontaining defects of graphene and G/CdS nanohybrids is a useful way to enhance the optical nonlinearity for potential applications in devices.

Citation Download Citation

Baohua Zhu, Fangfang Wang, and Yuzong Gu "Surface-related nonlinear optical enhancement in graphene and G/CdS nanohybrids", Proc. SPIE 10823, Nanophotonics and Micro/Nano Optics IV, 108230P (25 October 2018); https://doi.org/10.1117/12.2502656

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KEYWORDS

Graphene

Absorption

Nonlinear optics

Oxygen

Cadmium sulfide

FT-IR spectroscopy

Oxides

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