Meta-hologram-based authentication scheme employing a speckle pattern fingerprint

Y. Blau, O. Bar-On, Y. Hanein, A. Boag, J. Scheuer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A concept for an optical holographic security tag is proposed and demonstrated. When illuminated with a laser beam, the image scattered from the tag projects a Quick Response code which encodes identifying information. The image also carries pseudorandom speckle noise, from which a unique speckle pattern “fingerprint” is derived. We show numerically that the tag is unclonable without access to a secret key - the starting conditions of the design algorithm. However, given the key, it is straightforward to reproduce a tag exhibiting the expected fingerprint. Several tags have been realized, implemented as plasmonic meta-holograms, and characterized experimentally. The robustness of the tag to fabrication error and its resilience to counterfeiting are studied in detail and demonstrated experimentally.

Original languageEnglish
Pages (from-to)8924-8936
Number of pages13
JournalOptics Express
Issue number6
StatePublished - 16 Mar 2020


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