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arXiv · 2108.02195

Polarization switching of quasi-trapped modes and near field enhancement in bianisotropic all-dielectric metasurfaces

Andrey B. Evlyukhin·Maria Poleva·Alexey Prokhorov·Kseniia Baryshnikova·Andrey E. Miroshnichenko·Boris N. Chichkov
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Abstract

A general strategy for the realization of electric and magnetic quasi-trapped modes located at the same spectral position is presented. This strategy's application makes it possible to design metasurfaces allowing switching between the electric and magnetic quasi-trapped modes by changing the polarization of the incident light wave. The developed strategy is based on two stages: the application of the dipole approximation for determining the conditions required for the implementation of trapped modes and the creation of the energy channels for their excitation by introducing a weak bianisotropy in nanoparticles. Since excitation of trapped modes results in a concentration of electric and magnetic energies in the metasurface plane, the polarization switching provides possibilities to change and control the localization and distribution of optical energy at the sub-wavelength scale. We demonstrate a practical method for spectral tuning of quasi-trapped modes in metasurfaces composed of nanoparticles with a pre-selected shape. As an example, the optical properties of a metasurface composed of silicon triangular prisms are analyzed and discussed.

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Andrey B. Evlyukhin, Maria Poleva, Alexey Prokhorov, Kseniia Baryshnikova, Andrey E. Miroshnichenko, Boris N. Chichkov. 2021-08-04. Polarization switching of quasi-trapped modes and near field enhancement in bianisotropic all-dielectric metasurfaces. https://arxiv.org/abs/2108.02195

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