Light induced lens in a transparent nanosuspension
V.I. Ivanov, A.V. Myagotin
Far Eastern State Transport University
DOI: 10.26456/pcascnn/2025.17.059
Short communication
Abstract: Self-focusing of radiation is usually considered as a nonlinear effect in a medium with a positive coefficient of the cubic nonlinearity. Nanosuspensions have such nonlinearity due to electrostrictive flows of nanoparticles in a non-uniform light field. The description of this type of nonlinearity is traditionally limited to the consideration of the mode of weak intensities of the light field. In this case, the quasi-stationary change in the concentration of nanoparticles is directly proportional to the radiation intensity. Therefore, the analysis of the self-action of radiation corresponds to the classical case. In this paper, we analyze the self-focusing mode of a Gaussian beam in a transparent nanosuspension at high radiation intensities, when a response of the medium no longer corresponds to the cubic nonlinearity. A solution is given to the nonlinear stationary problem of light-induced transfer of nanoparticles in a liquid medium under the action of electrostrictive forces at high radiation intensities. The obtained result demonstrates an exponential dependence of the change in the concentration of nanoparticles on the radiation intensity. This is fundamentally different from the mode of weak intensities, where the change in concentration is linearly dependent on the intensity. In the classical case of the cubic nonlinearity, the self-focusing mode is determined by the total beam power. The considered model demonstrates a significant decrease in the critical self-focusing power at high radiation intensities, the use of which is more preferable for the experimental implementation of the self-focusing mode.
Keywords: self-action of the radiation, cubic nonlinearity, electrostriction, nanosuspension, self- focusing, critical power, optical diagnostics
- Valery I. Ivanov – Dr. Sc., Professor of the Department of Physics and Theoretical Mechanics, Far Eastern State Transport University
- Artiom V. Myagotin – Senior Lecturer of the Department of Physics and Theoretical Mechanics, Far Eastern State Transport University
For citation:
Ivanov V.I., Myagotin A.V. Samofokusirovka izlucheniya v prozrachnoj nanosuspenzii [Light induced lens in a transparent nanosuspension], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2025, issue 17, pp. 059-066. DOI: 10.26456/pcascnn/2025.17.059. ⎘
Full article (in Russian): download PDF file
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