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A bilayered chiral metamaterial (CMM) is proposed to realize a 90 degreepolarization rotator, whose giant optical activity is due to the transversemagnetic dipole coupling among the metallic wire pairs of enantiomericpatterns. By transmission through this thin bilayered structure of less than\lambda/30 thick, a linearly polarized wave is converted to its crosspolarization with a resonant polarization conversion efficiency (PCE) of over90%. Meanwhile, the axial ratio of the transmitted wave is better than 40 dB.It is demonstrated that the chirality in the propagation direction makes thisefficient cross-polarization conversion possible. The transversely isotropicproperty of this polarization rotator is also experimentally verified. Theoptical activity of the present structure is about 2700 degree/\lambda, whichis the largest optical activity that can be found in literature.

90 degree polarization rotator using a bilayered chiral metamaterial with giant optical activity