Use of metameric filters for future interference security image structures

Bill Baloukas; Stéphane Larouche; Ludvik Martinu

doi:10.1117/12.668924

9 February 2006 Use of metameric filters for future interference security image structures

Bill Baloukas, Stéphane Larouche, Ludvik Martinu

Proceedings Volume 6075, Optical Security and Counterfeit Deterrence Techniques VI; 60750T (2006) https://doi.org/10.1117/12.668924
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

In the present work, we describe innovative approaches and properties that can be added to the already popular thin film optically variable devices (OVD) used on banknotes. We show two practical examples of OVDs, namely (i) a pair of metameric filters offering a hidden image effect as a function of the angle of observation as well as a specific spectral property permitting automatic note readability, and (ii) multi-material filters offering a side-dependent color shift. We first describe the design approach of these new devices followed by their sensitivity to deposition errors especially in the case of the metameric filters where slight thickness variations have a significant effect on the obtained colors. The performance of prototype filters prepared by dual ion beam sputtering (DIBS) is shown.

Citation Download Citation

Bill Baloukas, Stéphane Larouche, and Ludvik Martinu "Use of metameric filters for future interference security image structures", Proc. SPIE 6075, Optical Security and Counterfeit Deterrence Techniques VI, 60750T (9 February 2006); https://doi.org/10.1117/12.668924

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