Three-photon absorption in water-soluble ZnS nanocrystals

Details Three-photon absorption in water-soluble ZnS nanocrystals Three-photon absorption in water-soluble ZnS nanocrystals

2006-05-05

arxiv.org/abs/cond-mat/0605131v1

Appl. Phys. Lett. 88, 181114 (2006)

Physics

Condensed Matter

Materials Science

15 pages, 4 figures

Scientific paper

10.1063/1.2198823

We report on large three-photon absorption (3PA) in glutathione-capped ZnS semiconductor nanocrystals (NCs), determined by both Z-scan and transient transmission techniques with 120-fs laser pulses. The monodispersed, water-soluble ZnS NCs are synthesized by a modified protocol with a mean diameter of 2.5 nm. Their 3PA cross-section is determined to be around 2.7x10^-78 cm^6s^2photon^-2 at an optimal wavelength of commercial Ti:sapphire femtosecond lasers. This value is nearly one order of magnitude greater than that of CdS NCs, and four to five orders of magnitude higher than those of the previously reported common UV fluorescent dyes.

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