Strong gyrotopy in a chiral toroidal medium
  In this letter, we present the first experimental study of a new chiral metamaterial consisting of toroidal wire windings. We show that the metamaterial exhibits three bands of circular dichroism in the GHz range. We discuss the response of the structure in terms of multipole moments, including the (magnetic) toroidal dipole moment. 
N. Papasimakis, V. A. Fedotov, K. Marinov, A. D. Boardman, N. I.   Zheludev