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

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

2010-01-17

arxiv.org/abs/1001.2908v1

Physics

Optics

16 pages, 4 figures

Scientific paper

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

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