This article is cited in 21 papers

Nonlinear optical phenomena

Nonlinear optical properties of colloidal silver nanoparticles produced by laser ablation in liquids

V. A. Karavanskii^a, A. V. Simakin^b, V. I. Krasovskii^a, P. V. Ivanchenko<sup>a

a</sup> Natural Sciences Center at General Physics Institute of RAS, Moscow
^b Wave Research Center of Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow

Abstract: The optical and nonlinear optical properties of colloidal solutions of silver obtained by laser ablation in water and ethanol are studied. It is shown that freshly prepared colloids experience a full or partial sedimentation by changing their nonlinear optical properties. Aqueous colloids undergo a partial sedimentation and their nonlinear optical absorption changes to nonlinear optical transmission. The obtained results are interpreted using the Drude model for metal particles taking the particle size into account and can be explained by the sedimentation of larger silver particles accompanied by the formation of a stable colloid containing silver nanoparticles with a tentatively silver oxide shell. The characteristic size of particles forming such a stable colloid is determined and its optical nonlinearity is estimated.

PACS: 78.67.Bf, 79.20.Ds, 42.70.Nq

Received: 13.01.2004

 English version: Quantum Electronics, 2004, 34:7, 644–648

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