Nonlinear optical properties of colloidal solutions of Ag2Se quantum dots passivated with 2-Mercaptopropionic acid in the field of 10 ns YAG:Nd3+ laser pulses

IF 1.5 4区物理与天体物理 Q3 OPTICS

The European Physical Journal D Pub Date : 2024-12-12 DOI:10.1140/epjd/s10053-024-00940-5

O. V. Ovchinnikov, A. I. Zvyagin, M. S. Smirnov, I. G. Grevtseva, S. V. Aslanov, A. Hussein

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Abstract

The results of a study of the nonlinear optical properties of Ag₂Se colloidal quantum dots (QDs) passivated with 2-mercaptopropionic acid (hereinafter Ag₂Se/2-MPA) with an average size of 2.0–2.5 nm in the field of 10 ns YAG:Nd³⁺ laser pulses are presented. Using the Z-scan method in an open aperture design, it was found that the nonlinear absorption in Ag₂Se/2-MPA colloidal QDs is due to reverse saturation absorption (RSA). In addition, Z-scanning in a closed-aperture scheme demonstrated nonlinear refraction, which manifested itself in the form of defocusing of the probing radiation. Dependences of the level of nonlinear absorption and refraction of laser pulses on the concentration of the Se precursor were discovered, which affects the crystallization conditions and the degree of nonstoichiometry of the formed nanocrystals, as well as the concentration of dangling bonds. The obtained patterns indicate the participation of localized states in the RSA process, and changes in the population of localized states determine the observed defocusing effect.

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来源期刊

The European Physical Journal D 物理-物理：原子、分子和化学物理

CiteScore

3.10

自引率

11.10%

发文量

213

审稿时长

3 months

期刊介绍： The European Physical Journal D (EPJ D) presents new and original research results in: Atomic Physics; Molecular Physics and Chemical Physics; Atomic and Molecular Collisions; Clusters and Nanostructures; Plasma Physics; Laser Cooling and Quantum Gas; Nonlinear Dynamics; Optical Physics; Quantum Optics and Quantum Information; Ultraintense and Ultrashort Laser Fields. The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.