Chinese Optics Letters, 2014, 12 (s1): S10604, Published Online: Jul. 31, 2014
All-dielectric metameric filters for optically variable devices Download: 845次
310.1620 Interference coatings 310.6845 Thin film devices and applications 310.6860 Thin films, optical properties
Abstract
In order to increase the anti-counterfeiting performance of optically variable devices, the innovative interference security image structures based on metamerism have been developed. In this letter, we show a pair of all-dielectric metameric filters offering a hidden image effect with the color shift at a specific angle of observation. These filters are designed by two materials TiO2/SiO2 based on the different angle color target optimization. The 6-layer- and 9-layer stacks are achieved and the performance of prototype filters prepared by remote plasma sputtering is shown. The color difference index of the experiment is up to 1.19, which shows good metameric matching effect.
Yikun Bu, Rong Guo, Yankai Li, Zengyou Meng, Nan Chen. All-dielectric metameric filters for optically variable devices[J]. Chinese Optics Letters, 2014, 12(s1): S10604.