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Manipulating Unidirectional Edge States Via Magnetic Plasmonic Gradient Metasurfaces

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Abstract

We show that a strongly enhanced coupling of spatially propagating electromagnetic waves to self-guiding unidirectional edge states (UESs) can be achieved by engineering a magnetic plasmonic gradient metasurface (GMS) made of an array of ferrite rods. The conversion efficiency of the incident photons into self-guiding UESs exhibits a transition from zero on an ordinary periodic surface to nearly 80 % on a surface incorporating a GMS. The underlying physics lies in that the magnetic plasmonic GMS enables a direct excitation of the edge states due to the band-folding or momentum compensation effect, which are in turn transformed into the self-guiding UESs on the ordinary periodic surface. The excitation of the UESs can also be revealed by considering the partial wave scattering amplitudes of the constituent rods on the surface, which manifests a change from a standing wave in the region subject to an external illumination to a self-guiding wave propagating and confined on the surface, a signature of UESs. The magnetic plasmonic GMS can also be used to implement the unidirectional phase control of the UES and the nonreciprocal Goos-Hänchen shift as a consequence of the time-reversal-symmetry breaking nature of the system and the strong coupling of the incident wave. In addition, the unidirectional features are shown to be flexibly controlled by either tailoring the gradient or tuning the external magnetic field, adding considerably to the performance of the magnetic plasmonic GMS systems.

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Acknowledgments

This work is supported by the China 973 Projects (Nos. 2011CB922004 and 2013CB632701), National Natural Science Foundation of China (Nos. 11174059, 11274277, 11404394, 11574055, and 11574275), Hong Kong Research Grants Council Grant HKUST2/CRF/11G, Zhejiang Provincial Natural Science Foundation of China (LR16A040001 and R12B040001), and the open project of State Key Laboratory of Surface Physics (KF2013_6) in Fudan University. JJL is supported by National Science Fund for Talent Training in Basic Science (No. J1103204).

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Authors and Affiliations

  1. Institute of Information Optics and Key Laboratory of Optical Information Detecting and Display Technology of Zhejiang Province, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China

    Huajin Chen, Jingjing Yu & Shiyang Liu

  2. School of Electrical and Information Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi, 545006, China

    Huajin Chen

  3. Department of Physics, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China

    Wanli Lu

  4. State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, 200433, China

    Huajin Chen, Juanjuan Li, Zhifang Lin & Shiyang Liu

  5. Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai, 200433, China

    Huajin Chen & Zhifang Lin

  6. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China

    Che Ting Chan

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  1. Huajin Chen
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  2. Wanli Lu
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  4. Jingjing Yu
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Correspondence to Shiyang Liu.

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Chen, H., Lu, W., Li, J. et al. Manipulating Unidirectional Edge States Via Magnetic Plasmonic Gradient Metasurfaces. Plasmonics 12, 1079–1090 (2017). https://doi.org/10.1007/s11468-016-0361-8

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  • DOI: https://doi.org/10.1007/s11468-016-0361-8

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