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Multipole optimization of light focusing by silicon nanosphere structures

Nikita Ustimenko, Kseniia V. Baryshnikova, Roman Melnikov, Danil Kornovan, Vladimir Ulyantsev, Boris N. Chichkov, and Andrey B. Evlyukhin

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Abstract

We investigate the applicability of the coupled multipole model and its modification in the framework of the zero-order Born approximation for modeling of light focusing by finite-size nanostructures of silicon nanospheres, supporting electric and magnetic dipole and quadrupole resonances. The results based on the analytical approximations are verified by comparison with the numerical simulations performed by the T-matrix method. Using the evolutionary algorithm optimization, we apply the developed approach to design silicon nanosphere metalenses with predefined focusing properties. The obtained results demonstrate a strong optimization potential of the suggested calculation scheme for engineering ultrathin metalenses.

© 2021 Optical Society of America

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