In contrast to the well-known cross-plane thermal conductance of a flat cavity, we show that the in-plane one increases with the gap distance up to 1 cm, for which it takes its maximum that increases with temperature. We find a maximum thermal conductance per unit width of 103 mW/(m*K) at 500K, which is pretty much equal to the radiative one predicted by Planck’s theory. This extra polariton thermal energy could hence be useful to amplify or evacuate heat currents along macroscale gaps. More information in our PRApplied paper here.
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