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Two-photon absorption and degenerate four-wave mixing studies of sulfide semiconductor nanoparticles in polymeric solutions

Jia, Wenling and Guo, Fengqi and Douglas, Elliot P. and Sun, Wenfang (2008) Two-photon absorption and degenerate four-wave mixing studies of sulfide semiconductor nanoparticles in polymeric solutions. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 8 (3). pp. 1364-1370.

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Official URL: http://www.ingentaconnect.com/content/asp/jnn/2008...

Abstract

The two-photon absorption coefficients (beta) and the third-order nonlinear susceptibilities (chi((3))) of several semiconductor nanoparticles (CdS, CdxAg1-xS, and core-shell CdS/Ag2S) that are confined and stabilized by random and block ionomers have been measured by nonlinear transmission and degenerate four-wave mixing techniques using 21 picosecond laser pulses at near-infrared spectral region. The imaginary part of the third-order nonlinear susceptibility that is related to the two-photon absorption coefficient was then calculated. The absorptive nonlinearity of the nanoparticles (2 similar to 9 nm) was found to be dependent on the particle size, composition and wavelength, i.e., larger CdS particles exhibit higher two-photon absorption coefficients and the presence of Ag improves two-photon absorption of CdS nanoparticles. The obtained two-photon absorption coefficients of nanoparticles corrected for their volume fraction in solution are significantly greater that those of corresponding bulk semiconductors.

Item Type:Article
Uncontrolled Keywords:two-photon absorption; degenerate four-wave mixing; third-order nonlinear susceptibility; nonlinear transmission; sulfide semiconductor nanoparticles
Subjects:Material Science > Nanostructured materials
Physical Science > Photonics
ID Code:1483
Deposited By:Farnush Anwar
Deposited On:15 Dec 2008 09:56
Last Modified:15 Dec 2008 09:56

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