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

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2 Author(s)
Ye, Yuqian ; Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentations, JORCEP [KTH-ZJU Joint Research Center of Photonics], Zhejiang University, Zijingang Campus, China ; Sailing He

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A bilayered chiral metamaterial is proposed to realize a 90° 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 λ/30 thick, a linearly polarized wave is converted to its cross polarization with a resonant polarization conversion efficiency of over 90%. It is demonstrated that the chirality in the propagation direction makes this efficient cross-polarization conversion possible.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 20 )

Date of Publication:

May 2010

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