Probing the Limits to Near-Field Heat Transfer Enhancements in Phonon-Polaritonic Materials,Nano Letters

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Probing the Limits to Near-Field Heat Transfer Enhancements in Phonon-Polaritonic Materials
Nano Letters ( IF 9.6 ) Pub Date : 2023-03-08 , DOI: 10.1021/acs.nanolett.2c04735
Rohith Mittapally ₁ , Ju Won Lim ₂ , Lang Zhang ₃ , Owen D Miller ₃ , Pramod Reddy _{1,

2} , Edgar Meyhofer ₁

Affiliation

Near-field radiative heat transfer (NFRHT) arises between objects separated by nanoscale gaps and leads to dramatic enhancements in heat transfer rates compared to the far-field. Recent experiments have provided first insights into these enhancements, especially using silicon dioxide (SiO₂) surfaces, which support surface phonon polaritons (SPhP). Yet, theoretical analysis suggests that SPhPs in SiO₂ occur at frequencies far higher than optimal. Here, we first show theoretically that SPhP-mediated NFRHT, at room temperature, can be 5-fold larger than that of SiO₂, for materials that support SPhPs closer to an optimal frequency of 67 meV. Next, we experimentally demonstrate that MgF₂ and Al₂O₃ closely approach this limit. Specifically, we demonstrate that near-field thermal conductance between MgF₂ plates separated by 50 nm approaches within nearly 50% of the global SPhP bound. These findings lay the foundation for exploring the limits to radiative heat transfer rates at the nanoscale.

中文翻译：

探索声子极化材料中近场传热增强的局限性

近场辐射传热 (NFRHT) 出现在由纳米级间隙分隔的物体之间，与远场相比，传热率显着提高。最近的实验提供了对这些增强的初步见解，特别是使用支持表面声子极化子 (SPhP) 的二氧化硅 (SiO ₂ ) 表面。然而，理论分析表明 SiO ₂中的 SPhP发生频率远高于最佳频率。_{在这里，我们首先从理论上表明，在室温下，SPhP 介导的 NFRHT 可以比 SiO 2}大 5 倍，支持 SPhP 的材料更接近 67 meV 的最佳频率。接下来，我们通过实验证明 MgF ₂和 Al ₂ O ₃接近这个极限。具体来说，我们证明了在全局 SPhP 约束的近 50% 范围内，相距 50 nm 的MgF ₂板之间的近场热导接近。这些发现为探索纳米级辐射传热速率的极限奠定了基础。

更新日期：2023-03-08

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