title: Microtags with 150-nm line gratings fabricated by use of extreme-ultraviolet lithography.
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 442nm . The smallest microtag measures 56micromx80 microm 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.
authors: M R
authors: MR
authors: Descour
authors: D I
authors: DI
authors: Simon
authors: W C
authors: WC
authors: Sweatt
authors: M E
authors: ME
authors: Warren
authors: S H
authors: SH
authors: Kravitz
authors: K D
authors: KD
authors: Krenz
authors: A K
authors: AK
authors: Ray-Chaudhuri
authors: R H
authors: RH
authors: Stulen