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3 October 2019 On how thick diffusers can contribute to the design of optical security systems
Kavan Ahmadi, Ignasi Juvells, Artur Carnicer
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Proceedings Volume 11207, Fourth International Conference on Applications of Optics and Photonics; 112071H (2019) https://doi.org/10.1117/12.2527393
Event: IV International Conference on Applications of Optics and Photonics (AOP 2019), 2019, Lisbon, Portugal
Abstract
We recently reported that phase encoded samples produced with metallic components (e.g. gold nano-particles) can be distinguished by means of polarized light. Classification was carried out using data obtained from speckle distributions. Despite this approach is very successful, it cannot be used with codes made of materials that do not change the state of polarization of the illumination source. In the present communication we analyze the feasibility of using optical diffusers as polarizing phase encoders for optical security systems. Preliminary optical results seem to support our thesis.
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Kavan Ahmadi, Ignasi Juvells, and Artur Carnicer "On how thick diffusers can contribute to the design of optical security systems", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071H (3 October 2019); https://doi.org/10.1117/12.2527393
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KEYWORDS
Diffusers
Optical design
Polarization
Information security
Speckle
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