  We demonstrate that the toroidal dipolar response can be realized in the
optical regime by designing a feasible nanostructured metamaterial, comprising
asymmetric double-bar magnetic resonators assembled into a toroid-like
configuration. It is confirmed numerically that an optical toroidal dipolar
moment dominates over other moments. This response is characterized by a strong
confinement of an E-field component at the toroid center, oriented
perpendicular to the H-vortex plane. The resonance-enhanced optical toroidal
response can provide an experimental avenue for various interesting optical
phenomena associated with the elusive toroidal moment.
