Abstract
The microtag concept is an anticounterfeiting and security measure. Microtags are computer-generated holograms (CGH's) consisting of 150-nm lines arranged to form 300-nm-period gratings. The microtags that we describe were designed for readout at 442 nm. The smallest microtag measures 56 μm × 80 μm 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.
Original language | English (US) |
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Pages (from-to) | 13-15 |
Number of pages | 3 |
Journal | Optics letters |
Volume | 23 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 1998 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics