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Tunable metasurfaces via the humidity responsive swelling of single-step imprinted polyvinyl alcohol nanostructures

Author

Listed:
  • Byoungsu Ko

    (Pohang University of Science and Technology (POSTECH))

  • Trevon Badloe

    (Pohang University of Science and Technology (POSTECH))

  • Younghwan Yang

    (Pohang University of Science and Technology (POSTECH))

  • Jeonghoon Park

    (Pohang University of Science and Technology (POSTECH))

  • Jaekyung Kim

    (Pohang University of Science and Technology (POSTECH))

  • Heonyeong Jeong

    (Pohang University of Science and Technology (POSTECH))

  • Chunghwan Jung

    (Pohang University of Science and Technology (POSTECH))

  • Junsuk Rho

    (Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH)
    POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics
    National Institute of Nanomaterials Technology (NINT))

Abstract

The application of hydrogels in nanophotonics has been restricted due to their low fabrication feasibility and refractive index. Nevertheless, their elasticity and strength are attractive properties for use in flexible, wearable-devices, and their swelling characteristics in response to the relative humidity highlight their potential for use in tunable nanophotonics. We investigate the use of nanostructured polyvinyl alcohol (PVA) using a one-step nanoimprinting technique for tunable and erasable optical security metasurfaces with multiplexed structural coloration and metaholography. The resolution of the PVA nanoimprinting reaches sub-100 nm, with aspect ratios approaching 10. In response to changes in the relative humidity, the PVA nanostructures swell by up to ~35.5%, providing precise wavefront manipulation of visible light. Here, we demonstrate various highly-secure multiplexed optical encryption metasurfaces to display, hide, or destroy encrypted information based on the relative humidity both irreversibly and reversibly.

Suggested Citation

  • Byoungsu Ko & Trevon Badloe & Younghwan Yang & Jeonghoon Park & Jaekyung Kim & Heonyeong Jeong & Chunghwan Jung & Junsuk Rho, 2022. "Tunable metasurfaces via the humidity responsive swelling of single-step imprinted polyvinyl alcohol nanostructures," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32987-6
    DOI: 10.1038/s41467-022-32987-6
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    References listed on IDEAS

    as
    1. Lie-Wen Xia & Rui Xie & Xiao-Jie Ju & Wei Wang & Qianming Chen & Liang-Yin Chu, 2013. "Nano-structured smart hydrogels with rapid response and high elasticity," Nature Communications, Nature, vol. 4(1), pages 1-11, October.
    2. Inki Kim & Jaehyuck Jang & Gyeongtae Kim & Jihae Lee & Trevon Badloe & Jungho Mun & Junsuk Rho, 2021. "Pixelated bifunctional metasurface-driven dynamic vectorial holographic color prints for photonic security platform," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    3. Gwanho Yoon & Kwan Kim & Daihong Huh & Heon Lee & Junsuk Rho, 2020. "Single-step manufacturing of hierarchical dielectric metalens in the visible," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    4. Xiaoyang Duan & Simon Kamin & Na Liu, 2017. "Dynamic plasmonic colour display," Nature Communications, Nature, vol. 8(1), pages 1-9, April.
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