Abstract
The microtag concept is an anticounterfeiting and security measure. Microtags are computer-generated holograms (CGH’s) consisting of lines arranged to form gratings. The microtags that we describe were designed for readout at . The smallest microtag measures when viewed at normal incidence. The CGH design process uses a modified iterative Fourier-transform algorithm to create either phase-only or phase-and-amplitude microtags. We also report on a simple and compact readout system for recording the diffraction pattern formed by a microtag. The measured diffraction patterns agree very well with predictions.
© 1998 Optical Society of America
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