Yongjoon Heo, Hyelim Kang, Joon-Seok Lee, You-Kwan Oh, and Shin-Hyun Kim, "Lithographically-Encrypted Inverse Opals for Anti-counterfeiting Applications", Small, accepted for publication (2016).
Photonic encryption technology is developed by designing polymeric inverse opals to have lithographically-featured wettability contrast. The encrypted inverse opals disclose combinatorial codes of color pattern and unique spectrum only when decoding solution is deposited. In addition, the codes are highly reproducible for repeated uses and long storage time. Moreover, the photonic films are mechanically stable, enabling transfer onto any surfaces.
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