Please use this identifier to cite or link to this item:
|Title:||Giant broadband nonlinear optical absorption response in dispersed graphene single sheets|
|Citation:||Lim, G.-K., Chen, Z.-L., Clark, J., Goh, R.G.S., Ng, W.-H., Tan, H.-W., Friend, R.H., Ho, P.K.H., Chua, L.-L. (2011-09). Giant broadband nonlinear optical absorption response in dispersed graphene single sheets. Nature Photonics 5 (9) : 554-560. ScholarBank@NUS Repository. https://doi.org/10.1038/nphoton.2011.177|
|Abstract:||Under intense laser excitation, thin films and suspensions of graphite and its nanostructure, including carbon black, nanotubes, few-layer graphenes and graphene oxides, exhibit induced transparency due to saturable absorption. This switches to optical limiting only at very high fluences when induced breakdown gives rise to microbubbles and microplasmas that causes nonlinear scattering. Here, we show that dispersed graphenes, in contrast, can exhibit broadband nonlinear optical absorption at fluences well below this damage threshold with a strong matrix effect. We obtained, for nanosecond visible and near-infrared pulses, a new benchmark for optical energy-limiting onset of 10 mJ cm -2 for a linear transmittance of 70%, with excellent output clamping in both heavy-atom solvents and polymer film matrices. Nanosecond pump-probe spectroscopy in chlorobenzene reveals that the nanographene domains switch from the usual broadband photo-induced bleaching to a novel reverse saturable absorption mechanism with increasing excitation densities across this threshold. © 2011 Macmillan Publishers Limited. All rights reserved.|
|Source Title:||Nature Photonics|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jan 15, 2019
WEB OF SCIENCETM
checked on Jan 7, 2019
checked on Dec 21, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.