  Possibility of magnetic energy accumulation inside silicon nanoparticles at
the conditions of resonant optical responses is investigated theoretically. The
magnetic field distributions inside silicon nanocylinders with and without
coaxial through holes are calculated using full-wave numerical approach. It is
demonstrated that such systems can be used for control and manipulation of
optical magnetic fields providing their enhancement up to 26 times at the
condition of optical resonances. Obtained results can be used for realization
of nanoantennas and nanolasers, in which magnetic optical transitions play
significant roles.
