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    We developed a novel switchable absorption device using magnesium (Mg) thin films. This device transitions from reflective to broadband absorbing states, enabling tunable optical functionality for photonic applications.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Optical switchability is crucial for advanced photonic devices.
    • Metal hydrides exhibit reversible and tunable optical property changes upon hydrogenation.
    • Hydrogenation causes lattice expansion in metals, significantly altering their optical characteristics.

    Purpose of the Study:

    • To propose and demonstrate a novel switchable absorption device.
    • To leverage the optical changes in magnesium (Mg) upon hydrogenation.
    • To combine Mg's optical tunability with a near-zero-index substrate for enhanced performance.

    Main Methods:

    • Fabrication of a device with a palladium (Pd)-capped Mg thin film on a near-zero-index substrate.
    • Modeling the substrate as a Drude material with a specific plasma wavelength.
    • Experimental demonstration using Mg/Pd thin films on an Indium Tin Oxide (ITO)-coated glass substrate.

    Main Results:

    • Calculated >70% absorption change from 650-1230 nm with peak absorption of 78% at 905 nm.
    • Experimentally achieved 76% absorption change at 1335 nm.
    • Demonstrated a maximum absorption of 93% in the hydride state utilizing ITO's near-zero-index properties.

    Conclusions:

    • The proposed device offers full switchability between reflective and broadband absorbing states.
    • Tuning the substrate's near-zero-index region allows for spectral extension from visible to infrared.
    • This technology enables tunable optical functionality for diverse photonic applications.