Dynamic Tuning of Near‐Field Radiative Thermal Rectification,Advanced Engineering Materials

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Dynamic Tuning of Near‐Field Radiative Thermal Rectification
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-10-06 , DOI: 10.1002/adem.202000825
Fangqi Chen ₁ , Xiaojie Liu ₁ , Yanpei Tian ₁ , Yi Zheng ₁

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Taking advantage of phase-transition and reconfigurable metamaterials, dynamic control of nanoscale thermal modulation can be achieved through the near-field radiative thermal rectification devices. In this work, an active-tuning near-field thermal rectifier using reconfigurable phase-transition metamaterials is explored. The rectifier has two terminals separated by vacuum, working under a controllable operational temperature around the critical temperature of the phase-transition material VO2. One of the terminals is a stretchable structure made of PDMS thin film and grating consisting of various types of phase-transition material. The effects of various inclusion forms and all the related geometric parameters are well analyzed. The controllable nanoscale thermal modulation can be achieved and the ultrahigh rectification ratios of 23.7 and 19.8, the highest values ever predicted, can be obtained for two deformation scenarios, respectively. It will shed light on the dynamic tuning of small-scale thermal transport and light manipulation.

中文翻译：

近场辐射热整流的动态调谐

利用相变和可重构超材料，可以通过近场辐射热整流器件实现纳米级热调制的动态控制。在这项工作中，探索了一种使用可重构相变超材料的有源调谐近场热整流器。整流器有两个由真空隔开的端子，在相变材料 VO2 临界温度附近的可控工作温度下工作。其中一个端子是由 PDMS 薄膜和光栅制成的可拉伸结构，光栅由各种类型的相变材料组成。很好地分析了各种夹杂形式和所有相关几何参数的影响。可以实现可控的纳米级热调制和23.7和19.8的超高整流比，可以分别针对两种变形情况获得有史以来预测的最高值。它将阐明小规模热传输和光操纵的动态调整。

更新日期：2020-10-06

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