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Title: Fe3O4-Ag nanocomposites for optical limiting: Broad temporal response and low threshold
Authors: Xing, G.
Jiang, J.
Ying, J.Y.
Ji, W. 
Issue Date: 15-Mar-2010
Citation: Xing, G., Jiang, J., Ying, J.Y., Ji, W. (2010-03-15). Fe3O4-Ag nanocomposites for optical limiting: Broad temporal response and low threshold. Optics Express 18 (6) : 6183-6190. ScholarBank@NUS Repository.
Abstract: We report the observation of optical limiting in Fe3O 4-Ag nanocomposites in solution, With these nanocomposites, we demonstrate that broad temporal optical limiting can be accomplished with low limiting threshold. Due to the presence of Ag nanoparticles, nonlinear scattering gives rise to enhanced optical limiting responses to 532-nm nanosecond laser pulses, with a limiting threshold comparable to carbon nanotubes. As exposed to 780-nm femtosecond laser pulses, the largest value (∼10-44 cm4s photon-1 or 106 GM) for two-photon absorption cross-sections reported to date results in superior limiting responses with a limiting threshold as low as 0.04 J/cm2 or 100 GW/cm2 for Fe3O4-Ag (7nm) solution in 1 cm quartz cell, The limiting threshold can be further reduced by increasing Ag particle size through plasmon enhancement or taking advantage of self-defocusing. © 2010 Optical Society of America.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OE.18.006183
Appears in Collections:Staff Publications

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