High-resolution 1D moiré s as counterfeit security features

Victor J. Cadarso, Sylvain Chosson, Katrin Sidler, Roger D Hersch, Jürgen Brugger

Research output: Contribution to journalArticleResearchpeer-review

35 Citations (Scopus)

Abstract

A moiré is an interference pattern that appears when two different periodic structures are overlaid. The image created is extremely sensitive to small variations in the original layers and is thus very interesting for anti-counterfeit protection. We present a microfabricated 1D moiré enabling complex high-resolution patterns as a significantly improved security feature that cannot be reproduced using standard printing methods. Furthermore, we demonstrate, theoretically and experimentally, that a microscopic deviation from the original design results in a macroscopic variation in the moiré that is clearly visible to the naked eye. The record resolution achieved in the elements fabricated and the increased design freedom, make these high-resolution moiré s excellent candidates for a variety of visually appealing security applications.

Original languageEnglish
Article numbere86
Pages (from-to)1-5
Number of pages5
JournalLight: Science and Applications
Volume2
DOIs
Publication statusPublished - 19 Jul 2013
Externally publishedYes

Keywords

  • Anti-counterfeiting
  • Micro-optical devices
  • Moiré effect
  • Optical security

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