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Light-Triggered Transmittance Control in Thermoresponsive Hydrogels by Femtosecond Laser Direct Writing
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    Light-Triggered Transmittance Control in Thermoresponsive Hydrogels by Femtosecond Laser Direct Writing
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    • Ken Kashikawa
      Ken Kashikawa
      School of Integrated Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
    • Hirofumi Tomikawa
      Hirofumi Tomikawa
      School of Integrated Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
    • Hiroaki Onoe
      Hiroaki Onoe
      School of Integrated Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
      Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
      More by Hiroaki Onoe
    • Mitsuhiro Terakawa*
      Mitsuhiro Terakawa
      School of Integrated Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
      Department of Electronics and Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
      *Email: [email protected]. Phone: +81-45-563-1737.
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    ACS Applied Optical Materials

    Cite this: ACS Appl. Opt. Mater. 2024, 2, 4, 565–573
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    https://doi.org/10.1021/acsaom.3c00470
    Published March 18, 2024
    Copyright © 2024 American Chemical Society

    Abstract

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    Thermoresponsive hydrogels, which exhibit changes in their optical properties and volume due to temperature variations, are promising candidates for applications in soft devices. In this study, we demonstrate the modulation of transmittance in a thermoresponsive hydrogel through light stimulation employing gold microstructures fabricated via multiphoton photoreduction. The spatial integration of photoresponsiveness, attributed to high-density gold nanoparticles within the thermoresponsive hydrogel, was accomplished through the high-speed laser scanning of femtosecond laser pulses. The temperature measurement during the fabrication of the gold microstructure revealed that the high-speed and multiple scanning over the same path effectively reduced the temperature in the irradiated area of femtosecond laser pulses. The present approach enabled the mitigation of thermal effects during the fabrication, resulting in minimizing distortion in the fine lines of the structures. Upon exposure to stimulus light, a rapid change in the transmittance of the region where the structures were fabricated was prominently observed. The present method unveils a promising avenue for the advancement of light-responsive soft devices.

    Copyright © 2024 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsaom.3c00470.

    • Additional experimental setup for absorption spectrum measurement and temperature measurement and thermal images obtained by the temperature measurement setup (PDF)

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    ACS Applied Optical Materials

    Cite this: ACS Appl. Opt. Mater. 2024, 2, 4, 565–573
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsaom.3c00470
    Published March 18, 2024
    Copyright © 2024 American Chemical Society

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