Abstract
An ultrathin dual-band planar chiral metamaterial (CMM) with giant optical activity using Fermat’s Spiral structure (FSs) was proposed, which could yield a near polarization angle independent 90° rotation characteristic. The proposed CMM can convert an incident linear polarization (y-/x-polarized) wave into its cross-polarization (x-/y-polarized) or experience a near 90° polarization rotation at 4.67 and 8.51 GHz, respectively. The experiment results are in agreement well with numerical simulation. The surface current distributions of unit-cell structure of the proposed CMM were analyzed to illustrate the physics mechanism of this giant optical activity with 90° polarization rotation. Good performances and compact design of the CMM suggest a promising application in 90° polarization rotator that need to be integrated with other compact devices.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 61605147) and the Natural Science Foundation of Hubei province (Grant No. 2017CFB588).
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Zhao, J., Cheng, Y. Ultrathin dual-band polarization angle independent 90° polarization rotator with giant optical activity based on planar chiral metamaterial. Appl. Phys. B 124, 185 (2018). https://doi.org/10.1007/s00340-018-7050-6
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DOI: https://doi.org/10.1007/s00340-018-7050-6