Journal
NANO LETTERS
Volume 11, Issue 12, Pages 5159-5164Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2023405
Keywords
Graphene; noncovalent functionalization; chemical exfoliation; ultrafast; self-phase modulation; coherent
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Funding
- Natural Science Foundation of China [10704085, 10974246, 20973195]
- National Basic Research Program of China [2007CB936804, 2012CB821402]
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We have developed an efficient chemical exfoliation approach for the high-throughput synthesis of solution-processable, high-quality graphene sheets that are noncovalently functionalized by alkylamine. Purely coherent nonlinear optical response of these graphene sheets has been investigated, using near-infrared, visible, and ultraviolet continous wave and ultrafast laser beams. Spatial self-phase modulation has been unambiguously observed in the solution dispersions. Our results suggest that this coherent light scattering is due to a broadband, ultrafast, and remarkably huge third-order optical nonlinearity chi((3)), which is a manifestation of the graphene's cone-shaped large-energy-scale band structure. Our experimental findings endow graphene new potentials in nonlinear optical applications.
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