1. Direct Optical Imagingof Graphene In Vitro by NonlinearFemtosecond Laser Spectral Reshaping.
- Author
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Li, Baolei, Cheng, Yingwen, Liu, Jie, Yi, Congwen, Brown, AprilS., Yuan, Hsiangkuo, Vo-Dinh, Tuan, Fischer, Martin C., and Warren, Warren S.
- Subjects
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NONLINEAR optics , *FEMTOSECOND lasers , *CHEMICAL microscopy , *GRAPHENE , *CHEMICAL vapor deposition , *CANCER cells , *IMAGING of cancer - Abstract
Nonlinear optical microscopy, based on femtosecond laserspectralreshaping, characterized and imaged graphene samples made from differentmethods, both on slides and in a biological environment. This techniqueclearly discriminates between graphene flakes with different numbersof layers and reveals the distinct nonlinear optical properties ofreduced graphene oxide as compared to mechanically exfoliated or chemicalvapor deposition grown graphene. The nonlinearity makes it applicableto scattering samples (such as tissue) as opposed to previous methods,such as transmission. This was demonstrated by high-resolution imagingof breast cancer cells incubated with graphene flakes. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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