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Security Authentication using Phase-Encoded Nanoparticle Structures and Polarized Light

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Phase encoded nano structures 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.

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CARNICER GONZÁLEZ, Arturo, HASSANFIROOZI, Amir, LATORRE-CARMONA, Pedro, HUANG, Yi-pai, JAVIDI, Bahram. Security Authentication using Phase-Encoded Nanoparticle Structures and Polarized Light. _Optics Letters_. 2015. Vol. 40, núm. 2, pàgs. 135-138. [consulta: 21 de gener de 2026]. ISSN: 0146-9592. [Disponible a: https://hdl.handle.net/2445/61126]

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