Graphene tunable dual-band nonreciprocal thermal emitter under TE polarization

Abstract

Nonreciprocal thermal radiation is an emerging research direction, which can be achieved by adding anisotropic magneto-optical materials to some optical components. At present, most of the research focuses on nonreciprocal thermal radiation under TM polarization. In this paper, we propose a nonreciprocal emitter under TE polarization, which is a dual-band nonreciprocal emitter. There are twice guided mode resonances (GMRs) between 13 μm and 16 μm. It is a grating composed of a metal Ag and a magneto-optical material InAs. When the applied magnetic field is 3T, more than 90 % nonreciprocity is achieved at the incident wavelengths of 13.845 μm and 15.32 μm. In addition, we add a layer of graphene to the grating ridge to tune the peak position. It has a wide range of applications for the study of nonreciprocal thermal radiation, which can improve the energy conversion efficiency.