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1 August 2007 Iterative algorithm analysis for phase-only diffractive control access system
Mona Mihailescu, Alexandru Preda, Dan Cojoc, Eugen Scarlat, Liliana Preda
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Proceedings Volume 6785, ROMOPTO 2006: Eighth Conference on Optics; 678513 (2007) https://doi.org/10.1117/12.757874
Event: ROMOPTO 2006: Eighth Conference on Optics, 2006, Sibiu, Romania
Abstract
A new architecture with two phases-only diffractive elements and one decryption mask for optical control access system is presented. Only three different persons which keep this element have the permission to access together. The Iterative Fourier Transform Algorithm (IFTA) is analyzed for phase-only diffractive optical elements (PODE) design with different constraints in the input and output plane and the optimal variant is chosen for better image quality in the output plane (big value for diffraction efficiency and small value for merit function and signal to noise ratio). For higher security we propose different incident waves. That are compared with the case when the first phase-only diffractive element and decryption masks are designed together in an extended iteration and the output images of them (first desired image) is taken over the second phase-only diffractive element. In order to increase security level, this finally PODE are designed to increase some parts from the first desired image. Only with this condition the key image on the detector is formed.
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Mona Mihailescu, Alexandru Preda, Dan Cojoc, Eugen Scarlat, and Liliana Preda "Iterative algorithm analysis for phase-only diffractive control access system", Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 678513 (1 August 2007); https://doi.org/10.1117/12.757874
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KEYWORDS
Spatial light modulators
Control systems
Fourier transforms
Diffractive optical elements
Diffraction
Spherical lenses
Information security
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