Multi-channel nonreciprocal radiation of transverse electric wave with photonic crystal heterostructure

An apparatus that accomplishes productive energy conversion by breaking conventional Kirchhoff's law is the nonreciprocal thermal emitter. Previous research universally focused on the nonreciprocal thermal emitter operated under transverse magnetic wave. The nonreciprocal thermal radiation proposed is operated under transverse electric (TE) wave, filling the gap in previous research. Meanwhile, the emitter, utilizing a photonic crystal (PC) heterostructure scheme composed of two one-dimensional PCs and an Al basement, accomplishes multi-channel nonreciprocal thermal radiation. With the external magnetic field of 3T, the emitter displays nonreciprocity behavior at bands of 15.933, 16.248, and 16.527 μm. Furthermore, under alternative sets of structural parameters, the structure can achieve four-port nonreciprocal radiation at bands of 16.437, 16.804, 17.139, and 17.478 μm. Both operating states indicate that the heterostructure under the magnetic field of 3 T exhibits nonreciprocal radiation performance for the TE wave. In addition, the exploration of the flat plate structure (IG)n(GI)mM shows that this scheme has multi-band nonreciprocity in TE wave.