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Proceedings Paper

Novel diffraction properties of high-contrast gratings
Author(s): Bala Pesala; Mridula Madhusudan
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Paper Abstract

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.

Paper Details

Date Published: 15 March 2013
PDF: 6 pages
Proc. SPIE 8633, High Contrast Metastructures II, 86330D (15 March 2013); doi: 10.1117/12.2007359
Show Author Affiliations
Bala Pesala, CSIR - Central Electronics Engineering Research Institute (India)
Mridula Madhusudan, CSIR - Central Electronics Engineering Research Institute (India)

Published in SPIE Proceedings Vol. 8633:
High Contrast Metastructures II
Connie J. Chang-Hasnain; Fumio Koyama; Alan Eli Willner; Weimin Zhou, Editor(s)

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