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We propose an approach to actively tune the scattering pattern of a Mie-typespherical antenna. The scheme is based on separate control over the inducedelectric dipole and induced magnetic dipole using two coherent focused beams ofradial polarization and azimuthal polarization. By carefully tuning theamplitude and phase relation of the two beams, a broadband unidirectionalscattering can be achieved, even at the wavelength where the antenna scattersmost efficiently. By moving the focus of one beam, a drastic switch of theunidirectional scattering can be observed. Such scheme enables the design ofultra-compact optical switches and directional couplers based on nanoantennas.

Broadband active tuning of unidirectional scattering from nanoantenna using combined radially and azimuthally polarized beams