Journal
OPTICS EXPRESS
Volume 21, Issue 21, Pages 24912-24921Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.024912
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Funding
- National Natural Science Foundation of China [61372034, 60990320, 60990324]
- foundation for Excellent Doctoral Dissertation of Air Force Engineering University [KGD080913001]
- 111 Project [111-2-05]
- National High Tech (863) Projects [2011AA010202, 2012AA030402]
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We propose a kind of chiral metamaterial inspired from the fractal concept. The Hilbert fractal perturbation in the twisted split ring resonator element results in compact metamaterial and breaking mirror symmetry, which readily forms chirality over triple bands. The discrepancy between co-polarization conversion and cross-polarization conversion over multiple bands can be explored for multifunctional devices. A multiband circular polarizer is then numerically and experimentally studied in the X band based on the bilayered twisted Hilbert resonator with mutual 90 degrees rotation. The ability of transforming linearly polarized incident waves to circularly polarized waves is unambiguously demonstrated with high conversion efficiency and large polarization extinction ratio of more than 20 dB across dual bands. Moreover, exceptionally strong optical activity and circular dichroism are also observed. (C) 2013 Optical Society of America
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