Near-field thermal upconversion and energy transfer through a Kerr medium.
Near-field thermal upconversion and energy transfer through a Kerr medium.
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DOI：
10.1364/oe.25.023164
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发表时间：
2017-02
期刊：
影响因子：
3.8
通讯作者：
C. Khandekar;Alejandro W. Rodriguez
中科院分区：
文献类型：
--
作者：
C. Khandekar;Alejandro W. Rodriguez
我们提出了一种在纳米尺度上实现克尔χ(3)介导的热能转移的方法，该方法利用三重共振四波混频过程的一般耦合模式描述。我们分析了平面几何结构中中红外到近红外波长的热上转换和能量传递的效率，这些平面几何结构包括两个支撑着相距很远的表面等离子体激元的平板，并且被一个受到外部入射光照射的非线性χ(3)介质隔开。我们研究了多种几何和材料配置以及不同类别的干预介质--嵌入在非线性材料中的块状或纳米结构纳米晶格纳米颗粒--旨在共振地增强入射光与热板共振的相互作用。我们发现，即使当整个系统处于热力学平衡(在室温下)，在典型的驱动强度~W/μm2下，所产生的上转换速率也可以接近甚至超过典型的对称和非平衡真空隔离板的热通量速率。所提出的非线性方案有可能被用来实现纳米尺度的热冷却和制冷，并主动控制具有显著不同共振响应的材料之间的热传递。
We present an approach for achieving large Kerr χ(3)-mediated thermal energy transfer at the nanoscale that exploits a general coupled-mode description of triply resonant, four-wave mixing processes. We analyze the efficiency of thermal upconversion and energy transfer from mid- to near-infrared wavelengths in planar geometries involving two slabs supporting far-apart surface plasmon polaritons and separated by a nonlinear χ(3) medium that is irradiated by externally incident light. We study multiple geometric and material configurations and different classes of intervening mediums-either bulk or nanostructured lattices of nanoparticles embedded in nonlinear materials-designed to resonantly enhance the interaction of the incident light with thermal slab resonances. We find that even when the entire system is in thermodynamic equilibrium (at room temperature) and under typical drive intensities ~ W/μm2, the resulting upconversion rates can approach and even exceed thermal flux rates achieved in typical symmetric and non-equilibrium configurations of vacuum-separated slabs. The proposed nonlinear scheme could potentially be exploited to achieve thermal cooling and refrigeration at the nanoscale, and to actively control heat transfer between materials with dramatically different resonant responses.