Strong dual-band nonreciprocal radiation based on a four-part periodic metal grating

Nonreciprocal radiation possesses many potential applications, such as solar photovoltaic system and military camouflage. However, the previous studies mainly focused on single-band nonreciprocal radiation. In this paper, a novel thermal emitter, in the form of a magneto-optical film sandwiched between a four-part periodic metal grating and a metal mirror, is designed and investigated. Numerical results show that the proposed emitter can achieve strong dual-band nonreciprocal radiation at wavelengths of 13.25 mu m and 15.858 mu m under a 3 T magnetic field when the angle of incidence is 25 degrees. The physical mechanism can be explained by the distributions of magnetic field at the resonant wavelengths. Furthermore, the nonreciprocal radiation is robust against the geometric dimensions, which greatly reduces the difficulty of fabrication. We believe that this work is promising in providing a new approach for the design of novel energy conversion devices and frequency selective detectors.

Automated summary

A novel thermal emitter capable of strong dual-band nonreciprocal radiation has been designed in this paper. Numerical results show promising performance under specific conditions, with robustness against geometric dimensions.