期刊
PHYSICAL REVIEW B
卷 97, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.045412
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) [KR 3844/2-1]
- MIT-Germany [2746830]
We develop fluctuational electrodynamics for media with nonlinear optical response in and out of thermal equilibrium. Starting from the stochastic nonlinear Helmholtz equation and using the fluctuation dissipation theorem, we obtain perturbatively a deterministic nonlinear Helmholtz equation for the average field, the physical linear response, as well as the fluctuations and Rytov currents. We show that the effects of nonlinear optics, in or out of thermal equilibrium, can be taken into account with an effective dielectric function. We discuss the heat radiation of a planar, nonlinear surface, showing that Kirchhoff's law must be applied carefully. We find that the spectral emissivity of a nonlinear nanosphere can in principle be negative, implying the possibility of heat-flow reversal for specific frequencies.
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