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. 2018 Jun 15;4(6):eaar6768. doi: 10.1126/sciadv.aar6768

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — Alice encrypts her messages for Tim (88), Bob (73), Ted (99), and so forth, all on one metasurface. Identical samples are sent to multiple receivers, who decrypt their respective messages according to the customized keys. The keys contain customer-specific information on the helicity of light (LCP, RCP, or LP), hydrogenation (H₂), dehydrogenation (O₂), and reaction duration. Different messages can be read out, corresponding to love and kisses for Tim, best regards for Bob, go away for Ted, and so forth, in Morse codes.