Liquid-permeable etalon for Janus colouration and asymmetric message hiding (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Liquid-permeable etalon for Janus colouration and asymmetric message hiding

Caption

a, Conceptual illustration of direction-sensitive asymmetric optical camouflage by tuneable optical Janus effect b, SEM images of the nanostructured Au film and CYTOP nanopillars. Scale bars, 200 nm. c, Photographs of solvent-immersed etalon demonstrating asymmetric message hiding seen from the frontside (upper) and backside (lower) under media of n = 1.0 (air), nsolvent = 1.3, 1.4, 1.5, 1.6, and 1.7 (solvents). Scale bars, 1 cm.

Credit

Taehyun Kim, Eui-Sang Yu, Young-Gyu Bae, Jongsu Lee, In Soo Kim, Seok Chung, Seung-Yeol Lee, and Yong-Sang Ryu

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