Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA.
Sci Rep. 2016 Sep 6;6:32744. doi: 10.1038/srep32744.
Recently, we proposed an active thermal extraction (ATX) scheme that enables thermally populated surface phonon polaritons to escape into the far-field. The concept is based on a fluorescence upconversion process that also occurs in laser cooling of solids (LCS). Here, we present a generalized analysis of our scheme using the theoretical framework for LCS. We show that both LCS and ATX can be described with the same mathematical formalism by replacing the electron-phonon coupling parameter in LCS with the electron-photon coupling parameter in ATX. Using this framework, we compare the ideal efficiency and power extracted for the two schemes and examine the parasitic loss mechanisms. This work advances the application of ATX to manipulate near-field thermal radiation for applications such as temperature sensing and active radiative cooling.
最近，我们提出了一种主动热提取 (ATX) 方案，使热激发的表面声子极化激元能够逸出到远场。该概念基于荧光上转换过程，该过程也发生在固体激光冷却 (LCS) 中。在这里，我们使用 LCS 的理论框架对我们的方案进行了广义分析。我们表明，通过用 ATX 的电子-光子耦合参数替换 LCS 中的电子-声子耦合参数，可以用相同的数学形式描述 LCS 和 ATX。利用该框架，我们比较了两种方案的理想效率和提取功率，并研究了寄生损耗机制。这项工作推进了 ATX 在温度传感和主动辐射冷却等应用中操控近场热辐射的应用。
