Strong nonreciprocal thermal radiation in Weyl semimetal-dielectric multilayer structure

The enhanced nonreciprocal radiation effect with Weyl semimetal-dielectric multilayer structure is investigated. It is shown that enhanced nonreciprocal radiation is achieved at the wavelength of 10 μm for incident angle of 30°. The physical interpretation of such enhanced nonreciprocity is revealed by studying the normalized magnetic field intensity at resonance. Moreover, the nonreciprocity increases with the increasing of the angle of incidence at the same operating wavelength. What's more, the radiation performances of the designed thermal emitter remain excellent within wide thicknesses ranges, which reduces the fabricating cost and will beneficial the potential applications. We believe that the concepts and conclusions obtained here should provide new possibilities to the development of novel energy harvesting devices and thermal emitters.