Demultiplexing and steering of guided light with dielectric nanoantennas

Andrey Bogdanov (Department of Physics and Engineering, ITMO University)

'Demultiplexing and steering of guided light with dielectric nanoantennas'

Abstract: All-dielectric nanoantennas proved to be a versatile tool for efficient light manipulation at the nanoscale. Their rich functionality and excellent performance arise due to strong magnetic and electric Mie resonances in low-loss subwavelength structures in the optical range. Here, we demonstrate that all-dielectric spherical nanoantennas placed on a substrate supporting guided modes provide efficient control over their directivity pattern, achieved due to the interplay between polarization of the incident light and the interference of electric and magnetic dipole resonances of the nanoantenna. As a proof of concept, we experimentally demonstrate plasmonic demultiplexing and beam steering with a single silicon nanoantenna using linear and circular polarization of light, respectively. Our approach offers unprecedented versatility for designing nanoscale antennas with applications in integrated nanophotonics and quantum optics.