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Optical and tribomechanical stability of optically variable interference security devices prepared by dual ion beam sputtering |
Applied Optics, Vol. 50, Issue 19, pp. 3351-3359 (2011)
http://dx.doi.org/10.1364/AO.50.003351
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Abstract
Optical security devices applied to banknotes and other documents are exposed to different types of harsh environments involving the cycling of temperature, humidity, chemical agents, and tribomechanical intrusion. In the present work, we study the stability of optically variable devices, namely metameric interference filters, prepared by dual ion beam sputtering onto polycarbonate and glass substrates. Specifically, we assess the color difference as well as the changes in the mechanical properties and integrity of all-dielectric and metal–dielectric systems due to exposure to bleach, detergent and acetone agents, and heat and humidity. The results underline a significant role of the substrate material, of the interfaces, and of the nature and microstructure of the deposited films in long term stability under everyday application conditions.
© 2011 Optical Society of America
OCIS Codes
(310.1620) Thin films : Interference coatings
(310.6860) Thin films : Thin films, optical properties
(310.6870) Thin films : Thin films, other properties
(330.1710) Vision, color, and visual optics : Color, measurement
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism
(310.6845) Thin films : Thin film devices and applications
ToC Category:
Thin Films
History
Original Manuscript: February 14, 2011
Revised Manuscript: April 19, 2011
Manuscript Accepted: April 20, 2011
Published: July 1, 2011
Virtual Issues
Vol. 6, Iss. 8 Virtual Journal for Biomedical Optics
Citation
Eda Çetinörgü-Goldenberg, Bill Baloukas, Oleg Zabeida, Jolanta Klemberg-Sapieha, and Ludvik Martinu, "Optical and tribomechanical stability of optically variable interference security devices prepared by dual ion beam sputtering," Appl. Opt. 50, 3351-3359 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-50-19-3351
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