title: Security authentication using the reflective glass pattern imaging effect.
abstract: The reflective glass pattern imaging effect is investigated experimentally for the utility in forming a synthetic 3D image as a security authentication device in this Letter. An array of homogeneously randomly distributed reflective elements and a corresponding micropattern array are integrated onto a thin layer of polyester film aiming to create a vivid image floating over a substrate surface, which can be clearly visible to the naked eye. By using the reflective-type configuration, the micro-optic system can be realized on a thinner substrate and is immune to external stain due to its flat working plane. A novel gravure-like doctor blading technique can realize a resolution up to 12,000 dpi and a stringent 2D alignment requirement should be imposed. Such devices can find applications in document security and banknotes or other valuable items to protect them against forgery.
authors.forename: Ji Cheng
authors.initials: JC
authors.lastname: Zhu
authors.forename: Su
authors.initials: S
authors.lastname: Shen
authors.forename: Jian Hong
authors.initials: JH
authors.lastname: Wu