Structure Design of VO2  ̄Based Multilayer Structure With Tunable Emittance
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TB34

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    Abstract:

    In present studyꎬ a multilayer structure comprised of VO2 layer was designed to achieve tunable emit ̄
    tance based on the principle of asymmetric Fabry ̄Perot (FP) cavity. Influence of thickness of different layers constitu ̄
    ting the multilayer structure on its emittance property and the angle dependence of the emittance were investigated u ̄
    sing the method of optical simulation computation.It is found that the variation of the emittance Δε increased first and
    then decreased with the thickness of VO2 increasing from 15 nm to 120 nm and the Δε reached a maximum at 50 nm
    of VO2 film. While the thickness of HfO2 layer influenced the position of absorption band of the multilayer structure
    and the Δε remained around the maximum of 0.6 at the wide range of thickness of HfO2 from 800 nm to 1 000 nm.
    The calculation for emittance of the multilayer structure at varied angles indicates that significant Δε of above 0.4
    could be remained in a wide range of angles from 0° to 70°.

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  • Received:
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  • Online: November 28,2016
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