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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Vanadium-dioxide microstructures with designable temperature-dependent thermal emission.

Romil Audhkhasi, Michelle L Povinelli

    Optics Letters
    |April 1, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We developed tunable thermal emitters using gold-vanadium dioxide microstructures. These emitters control thermal radiation differences between low and high temperature states by adjusting their structure, enabling advanced thermal management.

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    Area of Science:

    • Nanophotonics and Metamaterials
    • Condensed Matter Physics
    • Thermal Engineering

    Background:

    • Vanadium dioxide (VO2) exhibits a phase transition near room temperature, altering its optical properties.
    • Controlling thermal emission is crucial for applications like infrared camouflage and energy harvesting.
    • Metasurfaces offer precise control over electromagnetic wave interactions.

    Purpose of the Study:

    • To design and analyze gold-vanadium dioxide (VO2) microstructures for tunable thermal emission.
    • To investigate the temperature-dependent optical response of VO2-based waveguide cavities.
    • To demonstrate the creation of metasurfaces with switchable spatial emission patterns.

    Main Methods:

    • Incorporation of VO2 within a gold-dielectric-gold waveguide structure.
    • Analysis of temperature-dependent mode effective index and cavity resonance shifts.
    • Calculation of thermal radiated power across the 8-14 µm wavelength range.

    Main Results:

    • The fundamental resonance wavelength of the cavity shifts with temperature due to VO2 phase transition.
    • The difference in radiated power between low and high temperature states can be tuned (positive, negative, or zero) by adjusting cavity length.
    • Design of thermally emissive metasurfaces with temperature-invertible spatial emission patterns.

    Conclusions:

    • The proposed gold-VO2 microstructures provide a pathway for tunable thermal emitters.
    • Structural design offers precise control over the temperature-dependent radiative properties.
    • These emitters are potential building blocks for advanced metasurfaces for thermal radiation control.