Radiative heat transfer between metallic gratings using Fourier modal method with adaptive spatial resolution

摘要

We calculate the radiative heat transfer between two identical metallic one-dimensional lamellar gratings. Tothis aim we present and exploit a modification to the widely used Fourier modal method, known as adaptivespatial resolution, based on a stretch of the coordinate associated with the periodicity of the grating.We first showthat this technique dramatically improves the rate of convergence when calculating the heat flux, allowing us toexplore smaller separations. We then present a study of heat flux as a function of the grating height, highlightinga remarkable amplification of the exchanged energy, ascribed to the appearance of spoof-plasmon modes, whosebehavior is also spectrally investigated. Differently from previous works, our method allows us to explore a rangeof grating heights extending over several orders of magnitude. By comparing our results to recent studies we finda consistent quantitative disagreement with some previously obtained results going up to 50%. In some cases,this disagreement is explained in terms of an incorrect connection between the reflection operators of the twogratings.