15 March 2013 Novel diffraction properties of high-contrast gratings
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Proceedings Volume 8633, High Contrast Metastructures II; 86330D (2013) https://doi.org/10.1117/12.2007359
Event: SPIE OPTO, 2013, San Francisco, California, United States
High contrast sub-wavelength gratings (HCGs) possess unique diffraction properties such as steep angle diffraction, high diffraction efficiency with large spectral bandwidth. Here, we discuss the application of diffraction optimized HCG's as security tags with color shifting properties. Simulations of the gratings carried out using rigorous coupled wave analysis clearly show distinguishable color features for different angles of viewing. The designed security tags find application in documents which are prone to risk of counterfeiting.
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Bala Pesala, Bala Pesala, Mridula Madhusudan, Mridula Madhusudan, } "Novel diffraction properties of high-contrast gratings", Proc. SPIE 8633, High Contrast Metastructures II, 86330D (15 March 2013); doi: 10.1117/12.2007359; https://doi.org/10.1117/12.2007359

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