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.
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