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Metalens Focusing the Co-/cross-polarized Lights in Longitudinal Direction

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Abstract

Recently, metasurface has attracted lots of attentions because of its great capability in phase engineering for the transmitted cross-polarization light, and many functional optical elements have been designed and investigated. Commonly, the co-polarization and cross-polarization lights will coexist in the transmitted fields. Here, we propose a planar metalens composed of L-shaped nanoholes, which can focus an incident plane wave to two different focal spots in longitudinal direction for the co-polarized and cross-polarized transmitted lights respectively. In our design, the focal length of the transmitted cross-polarized lights can be tuned easily according to Fermat principle. Meanwhile, the focal length of the co-polarized transmitted lights can also be modulated by the ring number of the designed metalens. Because of the polarization-independent characteristic of the L-shaped nanoantenna, the designed planar metalens can also be suitable for both linear and circular polarized incident lights.

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Acknowledgments

The authors gratefully acknowledge the financial supports for this work from the National Natural Science Foundation of China under Grant No. 61575060 and No. 11374077, and the Fundamental Research Funds for the Central Universities (2015HGCH0010).

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Authors and Affiliations

  1. School of Computer and Information, Hefei University of Technology, Hefei, 230009, China

    Wei Wang, Zhongyi Guo, Yongxuan Sun & Fei Shen

  2. Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai, 264209, China

    Wei Wang, Zhongyi Guo, Guanghua Fan, Yan Li & Shiliang Qu

  3. Department of Physics, Harbin Institute of Technology, Harbin, 150001, China

    Keya Zhou & Shutian Liu

  4. College of Electronic Engineering, Heilongjiang University, Harbin, 150080, China

    Lingling Ran

Authors
  1. Wei Wang
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  2. Zhongyi Guo
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  3. Keya Zhou
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  5. Yongxuan Sun
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  7. Guanghua Fan
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  8. Yan Li
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  9. Shiliang Qu
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  10. Shutian Liu
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Correspondence to Zhongyi Guo.

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Wang, W., Guo, Z., Zhou, K. et al. Metalens Focusing the Co-/cross-polarized Lights in Longitudinal Direction. Plasmonics 12, 69–75 (2017). https://doi.org/10.1007/s11468-016-0230-5

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  • DOI: https://doi.org/10.1007/s11468-016-0230-5

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