Resonant Thermal Transport Driven by Surface Phonon-Polaritons in a Cylindrical Cavity

The axial thermal conductance of a cylindrical cavity supporting the propagation of hybridized guided modes along its interface with SiO2 is quantified and analyzed as a function of its radius and mean temperature. In contrast to the well-known radial thermal conductance, we show that the axial one increases with the cavity radius up to 1 cm, in which it takes its maximum that increases with temperature. A maximum thermal conductance of 289.4 nW.K-1 is found at 500 K, which is more than 3 orders of magnitude higher than the corresponding one found in the far-field regime. This top polariton thermal conductance along the cavity is comparable to the radiative one predicted by Planck's theory and thus represents a fundamental heat transport channel driven by hybridized guided modes able to amplify heat currents along a macroscale cylindrical cavity.

Automated summary

The axial thermal conductance of a cylindrical cavity supporting the propagation of hybridized guided modes along its interface with SiO2 is quantified and analyzed. It is shown that the axial thermal conductance increases with the cavity radius up to 1 cm and increases with temperature. At 500 K, a maximum thermal conductance of 289.4 nW.K-1 is found, which is more than 3 orders of magnitude higher than the corresponding one found in the far-field regime. This top polariton thermal conductance along the cavity represents a fundamental heat transport channel driven by hybridized guided modes.