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Enhanced reverse saturable absorption in graphene/Ag2S organic glasses
Qiuyun Ouyang1, Xinpeng Di, Zhenyu Lei
1Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
Physical Chemistry Chemical Physics : PCCP
|May 30, 2013
Summary
New graphene/silver sulfide (G/Ag2S) organic glasses show enhanced nonlinear absorption properties. These G/Ag2S/PMMA composites offer promising applications for optical limiters and shutters.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Graphene and silver sulfide (Ag2S) are known for their unique optical properties.
- Developing advanced composite materials is crucial for novel photonic applications.
Purpose of the Study:
- To synthesize and characterize graphene/silver sulfide (G/Ag2S) composites.
- To investigate the nonlinear absorption (NLA) properties of G/Ag2S/PMMA organic glasses.
- To explore the potential of these materials in optical limiting and shutter devices.
Main Methods:
- Hydrothermal synthesis of G/Ag2S composites.
- Characterization using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy.
- Fabrication of G/Ag2S/PMMA organic glasses.
- Nonlinear absorption measurements using the open-aperture Z-scan technique.
Main Results:
- Ag2S nanoparticles uniformly covered graphene surfaces in the synthesized composites.
- G/Ag2S/PMMA organic glasses exhibited enhanced reverse saturable absorption (RSA) compared to G/PMMA and Ag2S/PMMA.
- Synergistic effects between graphene and Ag2S, involving one-photon absorption (OPA) and two-photon absorption (TPA), were responsible for the enhanced RSA.
- Effective nonlinear absorption coefficient (βeff) reached the order of 10^3 cm/GW.
Conclusions:
- G/Ag2S/PMMA organic glasses demonstrate significantly improved nonlinear absorption properties.
- The observed enhancement is attributed to the synergistic interaction between graphene and Ag2S.
- These novel organic glasses hold great promise for applications in optical limiters and optical shutters.
