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3 October 2022 One-step nanoimprinting of PVA for dynamic dual-mode security metasurfaces
Trevon Badloe, Byoungsu Ko, Younghwan Yang, Junsuk Rho
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Proceedings Volume PC12196, Active Photonic Platforms 2022; PC121961A (2022) https://doi.org/10.1117/12.2632909
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
Hydrogels such as PVA have yet to be fully exploited in metasurfaces due to their fairly low refractive index and fabrication feasibility. Here, we demonstrate one-step nanoimprinted PVA metasurfaces with resolutions reaching sub-100 nm, and aspect ratios approaching 10. We then demonstrate three distinct relative humidity dependent dual-mode optical security applications using the PVA metasurfaces. Through the swelling of the PVA when exposed to high humidity conditions and careful design of meta-atoms with different dimensions orientated at specific angles, multiplexed color prints and holograms can be selectively uncovered or destroyed.
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Trevon Badloe, Byoungsu Ko, Younghwan Yang, and Junsuk Rho "One-step nanoimprinting of PVA for dynamic dual-mode security metasurfaces", Proc. SPIE PC12196, Active Photonic Platforms 2022, PC121961A (3 October 2022); https://doi.org/10.1117/12.2632909
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KEYWORDS
Information security
Humidity
Holography
Optical properties
Packaging
Printing
Receivers
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