Magnetic high-Q resonance in planar toroidal metamaterial

Vividly developing artificial magnetism introduces novel ways to capture magnetic field. The most satisfying results show metamaterials of different geometries. Recently introduced toroidal metamaterials seem to be an appealing playground the composing of artificial matter with enhanced magnetic properties. In this paper we propose toroidal planar metamaterial with the advantage of strong magnetic field localization. The structure supports toroidal dipole moment excitation, which has major contribution to metamaterial properties, i.e. high Q-factor and extremely strong magnetic field localization. We have designed and fabricated a metamaterial consisting of planar periodically arranged unit-cells for microwave applications. Proposed metamaterial paves the way for novel devices in light-matter interactions of magnetic nature. Moreover, the proposed metamaterial can be applied to higher frequencies where magnetic field localization is still a rather complicated problem with no additional difficulties in fabrication because of its planar structure.