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Subwavelength Micro-Antenna for Achieving Slow Light at Microwave Wavelengths via Electromagnetically Induced Transparency in 2D Metamaterials

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Abstract

In this paper, a tunable slow light 2D metamaterial is presented and investigated. The metamaterial unit cell is composed of three metallic strips as radiative and non-radiative modes. Once introducing asymmetry, a transparency window induced by coupling between the dark and bright modes is observed. The transmission characteristics and the slow light properties of the metamaterial are verified by numerical simulation, which is in a good agreement with theoretical predictions. The impact of asymmetric parameter on transparency window is also investigated. Simulation results show the spectral properties and the group index of the proposed 2D metamaterial can be tunned by adjusting asymmetric structure parameter, temperature and also the metal used in the metamaterial. Furthermore, the electromagnetic field distributions, excited surface currents, induced electric dipole and quadruples, and slow light properties of the metamaterial are investigated in details as well as transmission spectral responses. The outstanding result is that, the 2D-metamaterial is in a high decrease of the group velocity and therefore slow light applications, because in the best state, the group velocity in our structure decreases by a factor of 221 at T=100 K using copper as metal in optimization asymmetric case.

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Acknowledgments

Zohreh Vafapour would like to express her special thanks to Dr. Jacob B. Khurgin from The Johns Hopkins University for his useful discussions.

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  1. Department of Physics, College of Science, Shiraz University, Shiraz, 71946-84795, Iran

    Z. Vafapour & H. Alaei

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  1. Z. Vafapour
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  2. H. Alaei
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Correspondence to Z. Vafapour.

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Vafapour, Z., Alaei, H. Subwavelength Micro-Antenna for Achieving Slow Light at Microwave Wavelengths via Electromagnetically Induced Transparency in 2D Metamaterials. Plasmonics 12, 1343–1352 (2017). https://doi.org/10.1007/s11468-016-0392-1

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