  All-dielectric "magnetic light" nanophotonics based on high refractive index
nanoparticles allows controlling magnetic component of light at nanoscale
without having high dissipative losses. The artificial magnetic optical
response of such nanoparticles originates from circular displacement currents
excited inside those structures and strongly depends on geometry and dispersion
of optical materials. Here a new approach for increasing magnetic response via
resonant bianisotropy effect is proposed and analyzed. The key mechanism of
enhancement is based on electric-magnetic interaction between two electrically
and magnetically resonant nanoparticles of all-dielectric dimer nanoantenna. It
was shown that proper geometrical arrangement of the dimer in respect to the
incident illumination direction allows flexible control over all vectorial
components of magnetic polarizability, tailoring the later in the dynamical
range of 100 % and enhancement up to 36 % relative to performances of
standalone spherical particles. The proposed approach provides pathways for
designs of all-dielectric metamaterials and metasurfaces with strong magnetic
response.
