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<p>Switchable radiative coolers that can mitigate overcooling in low-temperature environment are highly desired in practical applications. In this work, switchable radiative coolers based on gratings of phase-change material vanadium dioxide (VO<sub>2</sub>) are investigated systematically. While grating structures offer the advantage in high-efficiency thermal emission, they are typically polarization-dependent, which is undesirable for radiative coolers. To address this, the polarization dependence through comparing different types of VO<sub>2</sub> gratings and optimizing their structural parameters are minimized. Furthermore, through exploring and optimizing the Fabry-Pérot resonances and catenary optical fields within the radiative coolers, high-efficiency radiative coolers based on VO<sub>2</sub> gratings at metallic state are designed. Notably, the functionality of such radiative coolers can be switched between cooling and heating states by changing the VO<sub>2</sub> gratings from metallic state to insulating state. This work provides valuable insights into intelligent radiative coolers with potential for large-scale applications.</p>

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Polarization-insensitive adaptive radiative cooler based on gratings of phase-change material VO2

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Jianzhong Shi,
  • Wen-Xuan Ge,
  • Lei Gao

摘要

Switchable radiative coolers that can mitigate overcooling in low-temperature environment are highly desired in practical applications. In this work, switchable radiative coolers based on gratings of phase-change material vanadium dioxide (VO2) are investigated systematically. While grating structures offer the advantage in high-efficiency thermal emission, they are typically polarization-dependent, which is undesirable for radiative coolers. To address this, the polarization dependence through comparing different types of VO2 gratings and optimizing their structural parameters are minimized. Furthermore, through exploring and optimizing the Fabry-Pérot resonances and catenary optical fields within the radiative coolers, high-efficiency radiative coolers based on VO2 gratings at metallic state are designed. Notably, the functionality of such radiative coolers can be switched between cooling and heating states by changing the VO2 gratings from metallic state to insulating state. This work provides valuable insights into intelligent radiative coolers with potential for large-scale applications.