Abstract
In this paper, we propose a chiral metamaterial structure that enables dual-band asymmetric transmission effect for different linearly polarized electromagnetic waves. The metamaterial is composed of metallic spirals with two split-ring resonators sandwiching a dielectric slab and connecting with via hole. Strong one-way transmission of two orthogonally polarized waves at different frequency bands has been confirmed through both full-wave simulation and test on fabricated prototype at the microwave band. Analysis also shows such asymmetric transmission can be attributed to the induced asymmetric current distributions in the spiral that support strong polarization conversion and cross-polarization transmission. By scaling down the metamaterial structure, the concept could also be utilized at other frequency bands, such as submillimeter or even terahertz band and find applications in designing one-way electromagnetic wave devices or polarization spectral filters.
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Acknowledgments
This work is partially supported by the National Nature Science Foundation of China (61301017, 61371034, 60990320, 61101011), the Key Grant Project of Ministry of Education of China (313029), the Ph.D. Programs Foundation of Ministry of Education of China (20100091110036, 20120091110032), and Partially supported by Jiangsu Key Laboratory of Advanced Techniques for Manipulating Electromagnetic Waves.
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Wu, L., Zhang, M., Zhu, B. et al. Dual-band asymmetric electromagnetic wave transmission for dual polarizations in chiral metamaterial structure. Appl. Phys. B 117, 527–531 (2014). https://doi.org/10.1007/s00340-014-5864-4
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DOI: https://doi.org/10.1007/s00340-014-5864-4