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Walter F, Li G, Meier C, et al. Ultrathin Nonlinear Metasurface for Optical Image Encoding. Nano Lett. 2017;17(5):3171-3175doi: 10.1021/acs.nanolett.7b00676.
Walter, F., Li, G., Meier, C., Zhang, S., & Zentgraf, T. (2017). Ultrathin Nonlinear Metasurface for Optical Image Encoding. Nano letters, 17(5), 3171-3175. https://doi.org/10.1021/acs.nanolett.7b00676
Walter, Felicitas, et al. "Ultrathin Nonlinear Metasurface for Optical Image Encoding." Nano letters vol. 17,5 (2017): 3171-3175. doi: https://doi.org/10.1021/acs.nanolett.7b00676
Walter F, Li G, Meier C, Zhang S, Zentgraf T. Ultrathin Nonlinear Metasurface for Optical Image Encoding. Nano Lett. 2017 May 10;17(5):3171-3175. doi: 10.1021/acs.nanolett.7b00676. Epub 2017 Apr 18. PMID: 28409930.
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Nano Lett. 2017 May 10;17(5):3171-3175. doi: 10.1021/acs.nanolett.7b00676. Epub 2017 Apr 18.

Ultrathin Nonlinear Metasurface for Optical Image Encoding.

Nano letters

Felicitas Walter, Guixin Li, Cedrik Meier, Shuang Zhang, Thomas Zentgraf

Affiliations

  1. Department of Physics, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany.
  2. Department of Materials Science and Engineering, Southern University of Science and Technology , 1088 Xueyuan Avenue, Shenzhen, 518055, China.
  3. School of Physics and Astronomy, University of Birmingham , Birmingham B15 2TT, United Kingdom.

PMID: 28409930 DOI: 10.1021/acs.nanolett.7b00676

Abstract

Security of optical information is of great importance in modern society. Many cryptography techniques based on classical and quantum optics have been widely explored in the linear optical regime. Nonlinear optical encryption in which encoding and decoding involve nonlinear frequency conversions represents a new strategy for securing optical information. Here, we demonstrate that an ultrathin nonlinear photonic metasurface, consisting of meta-atoms with 3-fold rotational symmetry, can be used to hide optical images under illumination with a fundamental wave. However, the hidden image can be read out from second harmonic generation (SHG) waves. This is achieved by controlling the destructive and constructive interferences of SHG waves from two neighboring meta-atoms. In addition, we apply this concept to obtain gray scale SHG imaging. Nonlinear metasurfaces based on space variant optical interference open new avenues for multilevel image encryption, anticounterfeiting, and background free image reconstruction.

Keywords: Metasurface; Pacharatman-Berry-phase; nonlinear; plasmonics; second harmonic generation

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