非线性克尔介质中的辐射换热
Radiative heat transfer in nonlinear Kerr media
摘要：
我们得到了一个描述非线性介质中热电磁涨落效应的涨落-耗散定理，我们利用它结合随机Langevin框架来研究Kerr（$χ^{(3)}$）光子腔在平衡态和非平衡态下与外界环境耦合的热辐射。我们发现，除了热展宽由于双光子吸收，这种腔的发射率可以表现出不对称的，非洛伦兹线形由于自相位调制。当腔体的局部温度大于外槽的局部温度时，我们发现，在相同的局部温度下，向外槽的热传递超过了来自相应的线性黑体的辐射。我们预测，这些温度可调的热过程中可以观察到实际的，纳米光子腔在相对较小的温度下工作。
英文摘要：
We obtain a fluctuation--dissipation theorem describing thermal electromagnetic fluctuation effects in nonlinear media that we exploit in conjunction with a stochastic Langevin framework to study thermal radiation from Kerr ($χ^{(3)}$) photonic cavities coupled to external environments at and out of equilibrium. We show that that in addition to thermal broadening due to two-photon absorption,the emissivity of such cavities can exhibit asymmetric,non-Lorentzian lineshapes due to self-phase modulation. When the local temperature of the cavity is larger than that of the external bath, we find that the heat transfer into the bath exceeds the radiation from a corresponding linear black body at the same local temperature. We predict that these temperature-tunable thermal processes can be observed in practical, nanophotonic cavities operating at relatively small temperatures.
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