Several methods of security enhancement of diffractive elements for security applications are presented, high carrier frequency cryptograms, Fresnel multi-focal cryptograms, and noise covered elements are introduced. Designed structures are realized on special integral dot-matrix system.
© 2004 Optical Society of America
M. Škereň, I. Richter, and P. Fiala, "Synthetical diffractive elements for security applications realized on enhanced integral dot-matrix system," in Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, OSA Technical Digest (Optical Society of America, 2004), paper DSuA6.
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