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Nearly-perfect circular polarization converter formed by triangular-geometric chiral metamaterial
Published in Institute of Electrical and Electronics Engineers Inc.
2016
Abstract
We demonstrate experimentally and numerically that a bilayer triangular-shaped chiral metamaterial (TCMM) gives a nearly perfect cross-polarization with 90% polarization conversion efficiency reported at X-band regime. The giant optical activity in the proposed TCMM arises due to the strong cross-coupling between the electric and magnetic dipole as a result of generated strong rotatory-power for the normally incident electromagnetic-wave. It is showed that TCMM can convert the linearly polarized wave into right/left circularly polarized wave. A chiral resonance at 10.32GHz rotates y-polarized electric field into x-polarized field with almost 90% transmission magnitude. Right and left circularly wave possesses different refractive-indices due to presence of chirality-factor (κ) in optically active TCMM metamaterial. The mechanism of cross-coupling is understood based on surface current distribution on the metallic patterns. The proposed polarization converter may be regarded as potential polarizing elements in optical polarization spectroscopy and microwave photonics applications with different length-scale. © 2016 European Association of Antennas and Propagation.
About the journal
JournalData powered by Typeset2016 10th European Conference on Antennas and Propagation, EuCAP 2016
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open AccessNo
Concepts (19)
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    Chemical reactions
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    Circular polarization
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    Conversion efficiency
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    Efficiency
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    Electric fields
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    Electromagnetic waves
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    Metamaterials
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    Optical materials
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    Refractive index
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    Surface plasmon resonance
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    CHIRAL METAMATERIAL
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    CIRCULARLY POLARIZED WAVES
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    Cross polarizations
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    OPTICAL ACTIVITY
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    OPTICAL POLARIZATION SPECTROSCOPY
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    POLARIZATION CONVERSION
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    POLARIZATION CONVERTERS
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    SURFACE CURRENT DISTRIBUTIONS
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    Polarization