  We propose a new type of highly efficient Yagi-Uda nanoantenna and introduced
a novel concept of superdirective nanoantennas based on silicon nanoparticles.
In addition to the electric response, this silicon nanoantennas exhibit very
strong magnetic resonances at the nanoscale. Both types of nanoantennas are
studied analytically, numerically and experimentally. For superdirective
nanoantennas we also predict the effect of the beam steering at the nanoscale
characterized by a subwavelength sensitivity of the beam radiation direction to
the source position.
