A multi-band nonreciprocal thermal emitter involving a Weyl semimetal with a Thue-Morse multilayer

The giant enhancement of multi-band nonreciprocal radiation based on the Weyl semimetal-dielectric spacer-Thue-Morse multilayer-metallic mirror structure, is investigated. As an illustration, a novel dual-band nonreciprocal thermal emitter based on the proposed scheme is designed and studied. The results show that two pairs of nonoverlapping absorptivity and emissivity spectra could be realized, which results in the realization of strong dual-band nonreciprocal radiation. The physical origin behind this phenomenon is revealed by the amplitude distribution of the magnetic field and confirmed by impedance matching theory. The dependence of the nonreciprocal radiation properties on the incident angle and the structure dimensions is investigated, and it is shown that the nonreciprocal performance remains stable in a large range of dimensions, which lowers the costs of fabrication. In addition, a multi-band nonreciprocal thermal emitter with a band number larger than two can be easily achieved by increasing the generation of the Thue-Morse multilayer. It is believed that the proposed scheme will promote the development of novel multi-band nonreciprocal thermal emitters.

Automated summary

The study investigates the significant enhancement of multi-band nonreciprocal radiation using the Weyl semimetal-dielectric spacer-Thue-Morse multilayer-metallic mirror structure. A novel dual-band nonreciprocal thermal emitter based on this scheme is designed and studied, achieving two pairs of nonoverlapping absorptivity and emissivity spectra and strong dual-band nonreciprocal radiation. The physical origin of this phenomenon is revealed using the amplitude distribution of the magnetic field and impedance matching theory. The dependence of the nonreciprocal radiation properties on incident angle and structure dimensions is investigated, showing stable performance in a large range of dimensions and lower fabrication costs. Moreover, the generation of Thue-Morse multilayer allows easy realization of a multi-band nonreciprocal thermal emitter with more than two bands, providing potential for the development of novel multi-band nonreciprocal thermal emitters.