Ultrathin dual-band polarization angle independent 90° polarization rotator with giant optical activity based on planar chiral metamaterial
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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.
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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