Microtags with 150-nm line gratings fabricated by use of extreme-ultraviolet lithography
- Optical Sciences Center, University of Arizona, Tucson, Arizona 85721 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
- Sandia National Laboratories, Livermore, California 94550 (United States)
The microtag concept is an anticounterfeiting and security measure. Microtags are computer-generated holograms (CGH{close_quote}s) consisting of 150{minus}nm lines arranged to form 300{minus}nm{minus}period gratings. The microtags that we describe were designed for readout at 442 nm . The smallest microtag measures 56 {mu}m{times}80 {mu}m 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. {copyright} {ital 1998} {ital Optical Society of America}
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 565738
- Journal Information:
- Optics Letters, Journal Name: Optics Letters Journal Issue: 1 Vol. 23; ISSN OPLEDP; ISSN 0146-9592
- Country of Publication:
- United States
- Language:
- English
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