Graphene-sandwiched Al/Si/InAs nonreciprocal emitter under transverse electric polarization adjusted by azimuth angle

Abstract

Nonreciprocal thermal radiation is a phenomenon that breaks the traditional Kirchhoff law of thermal radiation. In this paper, a nonreciprocal thermal radiation device based on grating structure is studied. We have also added a layer of graphene to the grating structure to improve the absorption and emission peaks of the structure. The anisotropic magneto-optical material used in this paper is InAs, and the additional magnetic field required is 2 T. Under TE polarization, the nonreciprocity of 88.28% and 88.42% can be achieved at the incident wave of 17.73 μm and 18.265 μm, respectively. The nonreciprocal thermal radiation device in this paper can control the distance between the two nonreciprocal peaks by adjusting the azimuth angle. We then further analyzed the double-layer profile of the structure and the tolerances of the structural parameters. The study of nonreciprocal thermal radiation is expected to improve the energy conversion efficiency of solar energy, thermal energy, etc.