Radiative thermal rectifiers capable of realizing asymmetric heat flux transfer have attracted a lot of research interests recently, mainly focusing on the engineering of the emissivity spectra. In this Letter, we propose a far-field radiative thermal rectifier utilizing the phase change material vanadium dioxide (${\mathrm{VO}}_2$). The thermal rectifier consists of a metamaterial infrared absorber and a two-layer thin-film structure acting as the active and the passive components, respectively. Numerical optimization has been carried out to control the emissivity spectra of both parts and maximize the overall rectification effect. A large thermal rectification factor of 3.5 is predicted at a temperature bias of $\mathrm{\Delta }\mathrm{T}=100\mathrm{K}$.

中文翻译：

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基于二氧化钒纳米结构的远场辐射热整流器

能够实现不对称热通量传递的辐射型热整流器近来引起了很多研究兴趣，主要集中在发射率光谱的工程上。在这封信中，我们提出了一种利用相变材料二氧化钒的远场辐射热整流器（${\mathrm{VO}}_{\mathrm{2个}}$）。热整流器由超材料红外吸收剂和分别用作主动和被动组件的两层薄膜结构组成。进行了数值优化，以控制两个部件的发射率谱并最大程度地提高整体整流效果。在温度偏置为的情况下，预计会有3.5的大热整流系数。$\mathrm{\Delta }\mathrm{Ť}=100\mathrm{ķ}$。