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Schematic of the geometry. Gray layers are dielectric slabs. The slabs are separated by vacuum.
(a) The projected band diagram for the -polarized modes for the structure shown in Fig. 1, with . The bands in the region are drawn in brown and those in the region are drawn in green. The vacuum and the material light lines are also shown. The inset shows the projection of the constant frequency surface on the plane for . (b) The blue line shows for polarization. The brown and green lines represent the contributions in the range and , respectively. (c) The black, blue, and red lines are the total , , and , respectively, as normalized to .
Normalized radiative thermal conductance for the structure shown in Fig. 1 with . The contributions of -polarized (blue curve) and -polarized (red curve) modes are summed to give the total conductance (black curve). The inset shows a wider range of temperature.
Normalized radiative thermal conductance as one varies slab separation . The temperature of , where significant variation as a function of occurs, is indicated as a vertical dotted line. The inset shows at , as varies continuously from to .
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