Spatial-polarization state scrambling for image encryption obtained with subwavelength gratings

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作者：
机构：
[1] Biener, Gabriel
[2] Niv, Avi
[3] Kleiner, Vladimir
[4] Hasman, Erez
来源：
Biener, G. | 2005年 / Optical Society of America (OSA)卷 / 16期
关键词：
Diffraction gratings - Image processing - Polarization - Security of data - Telecommunication networks;
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摘要：
The demand for better and faster security devices is a result of the problems created by unauthorized users and commercial spies gaining access to communication networks. One of the processes that has been extensively investigated is the optical encryption technique. Complex polarization-state manipulation by using computer-generated space-variant subwavelength gratings was observed. It was also observed that such polarization-state manipulations inevitably lead to a phase modification of geometrical origin. Geometrical phase encryption, which is realized by using an SWG, results in a robust and stable encryption scheme.
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