Pumping heated GaAs nanocrystals with 10.6 µm light upconverts 5 µm thermal radiation to roughly 3.4 µm and makes apparent emissivity rise while absorptivity falls, a demonstrated nonlinear breaking of Kirchhoff's law.
Zoysa, Conversion of broadband to narrowband thermal emission through energy recycling, Nat
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Breaking Kirchhoff's Law in Nonlinear Thermal Emission
Pumping heated GaAs nanocrystals with 10.6 µm light upconverts 5 µm thermal radiation to roughly 3.4 µm and makes apparent emissivity rise while absorptivity falls, a demonstrated nonlinear breaking of Kirchhoff's law.