Security authentication using phase-encoded nanoparticle structures and polarized light

Artur Carnicer*, Amir Hassanfiroozi, Pedro Latorre-Carmona, Yi-Pai Huang, Bahram Javidi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


Phase-encoded nanostructures such as quick response (QR) codes made of metallic nanoparticles are suggested to be used in security and authentication applications. We present a polarimetric optical method able to authenticate random phase-encoded QR codes. The system is illuminated using polarized light, and the QR code is encoded using a phase-only random mask. Using classification algorithms, it is possible to validate the QR code from the examination of the polarimetric signature of the speckle pattern. We used Kolmogorov-Smirnov statistical test and Support Vector Machine algorithms to authenticate the phase-encoded QR codes using polarimetric signatures.

Original languageEnglish
Pages (from-to)135-138
Number of pages4
JournalOptics Letters
Issue number2
StatePublished - 15 Jan 2015

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