Based on Kirchoff’s second law, we investigate the spectral-directional thermal emissivity of a photonic quantum well (PQW) structure with a zero-averaged-refractive-index (zero-) gap coating on an absorbing substrate. It is shown that the thermal emission through tunneling modes having frequencies in the zero- gap is not only weakly dependent on the emission angle and polarization state but also insensitive to the unit-cell size scaling of the barrier photonic crystal. More importantly, the PQW structure promises the frequency-selective thermal emission for both TE and TM polarization states along a well-defined direction. This may result in designing thermal antennas.
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