Humidity-sensitive polyvinyl alcohol metasurfaces for realizing advanced optical security

Byoungsu Ko; Trevon Badloe; Younghwan Yang; Junsuk Rho

doi:10.1117/12.3022774

6 June 2024 Humidity-sensitive polyvinyl alcohol metasurfaces for realizing advanced optical security

Byoungsu Ko, Trevon Badloe, Younghwan Yang, Junsuk Rho

Proceedings Volume PC12990, Metamaterials XIV; PC129901Z (2024) https://doi.org/10.1117/12.3022774
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

We explore the application of a single-step nanoimprinting technique using water-soluble Polyvinyl Alcohol (PVA) to fabricate tunable metasurfaces. These metasurfaces display multiplexed structural color and meta holography. The structured PVA achieved below 100 nm, accompanied by aspect ratios approaching 10. Under increasing relative humidity conditions, the PVA metaatom can expand by approximately 35.5%, allowing precise control of wavefronts. Here, we demonstrate the optical security metasurfaces for multiplexed encryption, capable of revealing, concealing, or eliminating information based on changes in relative humidity, both irreversibly and reversibly.

Citation Download Citation

Byoungsu Ko, Trevon Badloe, Younghwan Yang, and Junsuk Rho "Humidity-sensitive polyvinyl alcohol metasurfaces for realizing advanced optical security", Proc. SPIE PC12990, Metamaterials XIV, PC129901Z (6 June 2024); https://doi.org/10.1117/12.3022774

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