W. Ji — Page 4 | Searcharxiv

arXiv2003

Ultrafast Optical Nonlinearity in PMMA-TiO2 Nanocomposites

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.

cond-mat.mtrl-sci↗

arXiv2003

Nonlinear optical performances of supramolecular 1-(4-Methyl)- piperazinylfullerene[60] - containing polysiloxane

The nonlinear optical (NLO) properties of 1-(4-Methyl)- piperazinylfullerene[60] (MPF) incorporated with a polysiloxane copolymer denoted as PSI-46 have been studied using nanosecond laser pulses at 532-nm wavelength. The optical limiting performance of MPF itself is poorer than that of its parent C60, while the contribution of PSI-46 attached to the MPF shows marginally improvement from the ratio of MPF/PSI-46(1:2) to MPF/PSI-46(1:6). However, the effect can be neglected to the MPF optical limiting responses. The photoluminescence emission of MPF-containing polymers was slightly improved in comparison with that of MPF. The possible sources for the slightly improvement in the NLO behaviour are discussed.

cond-mat.mtrl-sci↗