近场热上转换和通过克尔介质的能量传递：理论
Near-field thermal upconversion and energy transfer through a Kerr medium : Theory
摘要：
我们提出了一种实现大克尔$χ^{(3)}$ -介导的热能转移在纳米级，利用一般的三重共振，四波混频过程的耦合模描述的方法。我们分析了热上转换和能量转移的效率，从中到近红外波长的平面几何形状，涉及两个平板支持相距很远的表面等离子体激元和分离的非线性$χ^{(3)}$介质，由外部入射光照射。我们研究了多种几何和材料配置和不同类别的interveening介质-无论是散装或纳米结构晶格的纳米颗粒嵌入非线性材料-旨在共振增强与热板共振的入射光的相互作用。我们发现，即使当整个系统处于热力学平衡（在室温下）和典型的驱动强度$\sim\mathrm{W}/μ\mathrm{m}^2$下，所得到的上转换率可以接近，甚至超过在典型的对称和非平衡配置的真空分离板实现的热通量率。所提出的非线性方案可能被利用来实现纳米级的热冷却和制冷，并主动控制具有显著不同谐振响应的材料之间的热传递。
英文摘要：
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 interveening 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 $\sim\mathrm{W}/μ\mathrm{m}^2$, 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.
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