OPTICAL CONTROL OF NANOPARTICLE DISTRIBUTION IN COLLOIDS WITH GAIN AND ABSORPTION

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Abstract

The effect of light on a composite system, which is an absorption/gain-balanced colloidal solution of absorbing nanoparticles in a gain medium, is studied. A model of a flat colloidal layer with normally incident plane (TEM) electromagnetic wave is considered. The combined action of striction and drag force (force arising from the transfer of photon momentum to absorbing particles) causes spatial redistribution of particle concentration, resulting in local disruption of absorption and gain balance in the layer, and spatial regions where light amplification and absorption occur are distinguished. It is shown that depending on the incident radiation intensity, both smooth and almost step-like nanoparticle concentration profiles can be realized. The corresponding distributions of the effective dielectric permittivity of the colloid possess PT (Parity-Time)-symmetry (satisfying condition  e(z) = e*(-z))  at low pump field intensity, but differ from PT-symmetric distributions at moderate and high intensities. Creating a controlled profile of local light gain and absorption can serve as a platform for studying specific non-Hermitian optical effects, and also expands the possibilities of optical diagnostics of nanoparticle distribution in colloidal solutions with compensated absorption.

About the authors

A. A. Zharov

Institute for Physics of Microstructures of the Russian Academy of Sciences

Email: zhani@appl.sci-nnov.ru
Russian Federation, Nizhny Novgorod, 603950

N. A. Zharova

Institute of Applied Physics of the Russian Academy of Sciences

Author for correspondence.
Email: zhani@appl.sci-nnov.ru
Russian Federation, Nizhny Novgorod, 603950

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