Journal
OPTICS COMMUNICATIONS
Volume 196, Issue 1-6, Pages 317-323Publisher
ELSEVIER
DOI: 10.1016/S0030-4018(01)01375-X
Keywords
nonlinear refraction; optical limiting; surface plasmon resonance; nanocomposite
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Nonlinear optical properties of three novel nanocomposites with zerovalent noble metal gold nanoparticles were investigated by using Z-scan technique. Optical limiting effects has been measured with 8 ns pulses at 532 nm. The cross-sections of nonlinear absorption were obtained by the simulation with a simplified model in which the effective excited-state absorptions of three ligands in nanocomposites were considered. The nonlinear refractive indices were calculated from the data of Z-scan measurement. The experimental results were found to be significantly different in these nanocomposites. Optical nonlinearities in these nanocomposites can be attributed to the strong excited-state absorptions of the ligands and the surface plasmon resonance of gold nanoparticles. (C) 2001 Elsevier Science B.V. All rights reserved.
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