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Variable transmission optical filter based on an actuated origami structure.

Brian Roberts, Megha Ghosh, Pei-Cheng Ku

    Applied Optics
    |May 14, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel variable transmission thin film using mechanically actuated origami and metallic nanoparticles. This smart film offers tunable light transmittance from 0 to over 90% for smart glass applications.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Traditional smart glass technologies often face limitations in terms of switching speed, power consumption, or continuous tunability.
    • Metallic nanoparticles offer unique plasmonic properties that can be exploited for optical applications.

    Purpose of the Study:

    • To propose and investigate a novel variable transmission thin film based on mechanically actuated origami structures coated with metallic nanoparticles.
    • To demonstrate continuous tunability of optical transmittance for visible light.
    • To assess the potential of this technology for smart glass applications.

    Main Methods:

    • Fabrication of an origami structure coated with asymmetric metal nanorods.
    • Mechanical actuation to control the orientation of nanorods relative to incident light.
    • Optical characterization of transmittance across the visible spectrum.
    • Evaluation of image transmission clarity and switching speed.

    Main Results:

    • Achieved continuous tunable transmissivity from 0 to over 90% for unpolarized light.
    • Demonstrated that power is only needed for switching, not for maintaining transmittance states.
    • Identified two distinct plasmon resonances due to asymmetric nanorods, enabling optical control.
    • Observed fast switching speeds limited only by mechanical actuation.
    • Confirmed good image transmission clarity with minimal distortion.

    Conclusions:

    • The proposed mechanically actuated origami-based thin film with metallic nanoparticles is a promising technology for variable light transmission.
    • The system offers efficient, continuous, and low-power tunable optical transmittance.
    • The technology shows significant potential for advanced smart glass applications requiring high clarity and rapid response.