Thermal transport via surface phonon polaritons across a two-dimensional pore

Abstract

Thermal radiative transport across a microscale evacuated two-dimensional (2D) pore is approximated classically using the fluctuation-dissipation theorem and a Green function approach. The results of this work show that for 2D pores bounded by surface active ceramics, a radius range can be identified where thermal exchange may be dominated by surface phonon polaritons, and thus a coherence length longer than that typically associated with thermal radiation. This extended coherence length may significantly affect thermal radiative transport in some microporous materials of micro- to mesoscale dimensions.