Optical LPP/LCP devices: a new generation of optical security elements

Franco Moia; Hubert Seiberle; Martin Schadt

doi:10.1117/12.382188

7 April 2000 Optical LPP/LCP devices: a new generation of optical security elements

Franco Moia, Hubert Seiberle, Martin Schadt

Proceedings Volume 3973, Optical Security and Counterfeit Deterrence Techniques III; (2000) https://doi.org/10.1117/12.382188
Event: Electronic Imaging, 2000, San Jose, CA, United States

Abstract

With linear photo polymerization (LPP) ROLIC has developed a new photo-patternable technology which enables to align not only conventional liquid crystals bu also LCP. ROLICs optical security device technology derives from its LPP/LCP technology. LPP/LCP security devices are crated by structured photo-alignment of an LPP layer through photo- masks, thus generating a high resolution, photo-patterned aligning layer which carries the aligning information of the image to be created and which is machine readable. The subsequent LCP layer transforms the aligning information into an optical phase image. Among a large number of possible LPP/LCP optical effects that lead to LPP/LCP security devices - all of them with distinct optical appearance - we will concentrate on the following LPP/LCP security elements: Reflective and transmissive LPP/LCP security devices for 2nd level inspection applications. LPP/LCP images are invisible when viewed with the naked eye but becomes visible when viewed through a polarizer. Rotation of the polarizer leads to contrast inversion: i.e. the image changes from 'positive' to 'negative' which is an additional unique security feature. Other types of LPP/LCP security devices are based on cholesteric films. We will present 2nd level cholesteric LPP/LCP devices which can be sued as overlays and superimposed on printed information which remains visible through the overlay.

Citation Download Citation

Franco Moia, Hubert Seiberle, and Martin Schadt "Optical LPP/LCP devices: a new generation of optical security elements", Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000); https://doi.org/10.1117/12.382188

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