DUAL-BAND CIRCULAR POLARIZER AND LINEAR POLARIZATION TRANSFORMER BASED ON TWISTED SPLIT-RING STRUCTURE ASYMMETRIC CHIRAL METAMATERIAL

In this paper, a bi-layer twisted split-ring structure asymmetric chiral metamaterial was proposed, which could achieve circularly polarized (giant circular dichroism effect) wave with dual bands and linear polarization transformation (giant optical activity) with asymmetric transmission wave emissi...

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Bibliographic Details
Published in:Electromagnetic waves (Cambridge, Mass.) Mass.), 2014-02, Vol.145, p.263-272
Main Authors: Cheng, Yong Zhi, Nie, Yie, Cheng, Zheng Ze, Gong, Rong Zhou
Format: Article
Language:English
Subjects:
Electric fields
Optical instruments
Transformers
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Summary:In this paper, a bi-layer twisted split-ring structure asymmetric chiral metamaterial was proposed, which could achieve circularly polarized (giant circular dichroism effect) wave with dual bands and linear polarization transformation (giant optical activity) with asymmetric transmission wave emissions simultaneously from linearly polarized incident wave at microwave frequencies. Experiment and simulation calculations are in good agreement, indicating that the dual-band circular polarizer features high conversion efficiency around 5.32 GHz and 6.6 GHz in addition to large polarization extinction ratio of more than 16 dB, while cross linear polarization transformation with asymmetric transmission is observed around 10.52 GHz. The transformation behavior for both circular and linear polarizations could be further illustrated by simulated surface current and electric field distributions. The proposed asymmetric chiral metamaterial structure could be useful in designing novel EM or optical devices, as well as polarization control devices.
ISSN:1559-8985
1070-4698
1559-8985
DOI:10.2528/PIER14020501