1 April 1990 Zero-order diffractive microstructures for security applications
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The optical characteristics of diffractive microstructures designed for zero-order read-out are discussed. Such devices offer new optical behaviour which can be exploited for applications in the field of visual and machine readable security features. They can be fabricated by low-cost embossing and evaporation techniques.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael T. Gale, Karl Knop, Rudolph H. Morf, "Zero-order diffractive microstructures for security applications", Proc. SPIE 1210, Optical Security and Anticounterfeiting Systems, (1 April 1990); doi: 10.1117/12.17917; https://doi.org/10.1117/12.17917

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