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Ultrafast Optical Nonlinearity in PMMA-TiO2 Nanocomposites

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arxiv cond-mat/0301153 v2 pith:NG4X426P submitted 2003-01-10 cond-mat.mtrl-sci physics.atm-clusphysics.chem-phphysics.optics

Ultrafast Optical Nonlinearity in PMMA-TiO2 Nanocomposites

H.I. Elim , W. Ji , A.H. Yuwono , J.M. Xue , J. Wang This is my paper
classification cond-mat.mtrl-sci physics.atm-clusphysics.chem-phphysics.optics
keywords nanocompositesnonlinearityopticalpmma-tio2filmsobservedultrafastall-optical
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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With 780-nm, 250-fs laser pulses, ultrafast optical nonlinearity has been observed in a series of thin films containing PMMA-TiO2 nanocomposites, which are synthesized by a simple technique of in-situ sol-gel/polymerization. The best figures of merit are found in one of the films prepared with a 60% weight percentage of titanium isopropoxide. TEM shows the presence of the 5-nm-diameter particles in the film. The observed optical nonlinearity has a recovery time of ~1.5 ps. These findings suggest the strong potential of PMMA-TiO2 nanocomposites for all-optical switching.

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