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arXiv 1802.05744physics.optics
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二维有耗金属近场辐射换热的材料尺度和频率选择性强化

Material Scaling and Frequency-Selective Enhancement of Near-Field Radiative Heat Transfer for Lossy Metals in Two Dimensions via Inverse Design

Weiliang Jin, Sean Molesky, Zin Lin, Alejandro W. Rodriguez

备注：
6 pages, 2 figures
发表信息：
Phys. Rev. B 99, 041403 (2019)
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摘要：

近场辐射热传递的超普朗克特性强烈依赖于材料和几何设计特性。然而，这两个方面的相对重要性和相互作用，以及它们在多大程度上可用于最终控制能量流，仍然是一个悬而未决的问题。最近导出的界限表明，增强大到$|χ|^4 λ^{2} / \left(\left(4π\right)^{2} \Im\left[χ\right]^{2} d^{2}\right)$之间的扩展结构（与黑体相比）是可能的，但既没有几何形状达到这个界限，也没有设计揭示预测的材料（$χ$）缩放，先前已报道。在这里，利用逆技术，结合快速的计算方法，使不相交的机构的椭圆算子的低秩属性，我们调查材料和几何形状之间的这种关系在一个扩大的空间结构。至关重要的是，我们发现，上述物质比例确实出现在现实结构中。在达到这一结果，我们还表明，（在两个维度上）有损耗的金属，如钨，通常被认为是穷人的候选材料，在近红外线强烈增强传热，可以被构造为选择性地实现通量率内的$50\%$表现出的一个理想的一对共振无损金属分离小到$2\%$的可调设计波长。

英文摘要：

The super-Planckian features of radiative heat transfer in the near-field are known to depend strongly on both material and geometric design properties. However, the relative importance and interplay of these two facets, and the degree to which they can be used to ultimately control energy flow, remains an open question. Recently derived bounds suggest that enhancements as large as $|χ|^4 λ^{2} / \left(\left(4π\right)^{2} \Im\left[χ\right]^{2} d^{2}\right)$ are possible between extended structures (compared to blackbody); but neither geometries reaching this bound, nor designs revealing the predicted material ($χ$) scaling, have been previously reported. Here, exploiting inverse techniques, in combination with fast computational approaches enabled by the low-rank properties of elliptic operators for disjoint bodies, we investigate this relation between material and geometry on an enlarged space structures. Crucially, we find that the material proportionality given above does indeed emerge in realistic structures. In reaching this result, we also show that (in two dimensions) lossy metals such as tungsten, typically considered to be poor candidate materials for strongly enhancing heat transfer in the near infrared, can be structured to selectively realize flux rates that come within $50\%$ of those exhibited by an ideal pair of resonant lossless metals for separations as small as $2\%$ of a tunable design wavelength.

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