A comparative study of anti-Stokes shift under stimulated Rayleigh-Mie scattering in suspensions of Ag nanoparticles obtained in plasma discharge in liquid under ultrasonic cavitation

Nikolay A. Bulychev; Alexandr I. Erokhin; Mishik A. Kazaryan

doi:10.1117/12.2550775

11 December 2019 A comparative study of anti-Stokes shift under stimulated Rayleigh-Mie scattering in suspensions of Ag nanoparticles obtained in plasma discharge in liquid under ultrasonic cavitation

Nikolay A. Bulychev, Alexandr I. Erokhin, Mishik A. Kazaryan

Author Affiliations +

Proceedings Volume 11322, XIV International Conference on Pulsed Lasers and Laser Applications; 113222G (2019) https://doi.org/10.1117/12.2550775
Event: XIV International Conference on Pulsed Lasers and Laser Applications (AMPL-2019), 2019, Tomsk, Russian Federation

Abstract

Stimulated Rayleigh–Mie scattering (SRMS) in two-photon absorption liquids is realized by a Fourier transform-limited pulsed Nd-glass laser. For the first time, we have measured anti-Stokes spectral shifts of SRMS in toluene and hexane colloids of Ag nanoparticles, as well as in pure toluene. The suspensions are prepared in the plasma discharge excited in a liquid exposed to an intense ultrasonic field above the cavitation threshold. This novel technique has been developed for the synthesis of various nano-sized materials; it provides silver nanoparticles suspensions with controlled narrow distribution of the particle size. Ultrasonic cavitation results in a drastic change in the physical properties of the liquid, providing specific conditions in the electrical discharge plasma. Ag nanoparticles with 1-2 nm radii in toluene and hexane are obtained from silver electrodes under these specific conditions and acquire unique surface characteristics which prevent them from secondary agglomeration. The values of anti-Stokes spectral shifts of SRMS appreciably exceed the Rayleigh line width in those liquids. The four-wave mixing method is applied both experimentally and theoretically to display the process as Rayleigh-induced parametric generation. We show that the amplification effect is provided predominantly by thermally induced coherent polarization oscillations, while an interference-assisted thermal grating provides formation of a self-induced optical cavity inside the interaction region.

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Nikolay A. Bulychev, Alexandr I. Erokhin, and Mishik A. Kazaryan "A comparative study of anti-Stokes shift under stimulated Rayleigh-Mie scattering in suspensions of Ag nanoparticles obtained in plasma discharge in liquid under ultrasonic cavitation", Proc. SPIE 11322, XIV International Conference on Pulsed Lasers and Laser Applications, 113222G (11 December 2019); https://doi.org/10.1117/12.2550775

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