Dual-polarization strong nonreciprocal thermal radiation with silicon-based nanopore arrays

Most nonreciprocal thermal radiations are known to work under TM polarization, which casts limitation for the application of nonreciprocal systems. This poses a significant challenge to the dual-polarization nonreciprocal thermal radiations. In this work, the dual-polarization strong nonreciprocal thermal radiations with nanopore arrays are proposed and systematically investigated. This novel nonreciprocal radiation that adopts silicon as the substrate is built by the stacked metal layer (Al), magneto-optical layer (InAs), and silicon-based nanopore ar-rays. Rigorous coupled-wave analysis theory (RCWA) and coupled-mode theory (CMT) are used to study the impact of two-dimensional silicon-based nanopore arrays on the nonreciprocity under different polarizations. With the finite element method, impedance matching theory and the electromagnetic field distribution at the resonant wavelength, the physical phenomenon that the proposed device exhibits dual-polarization strong nonreciprocal radiation is explained. Compared to the structures of photonic crystal and one-dimensional (1D) periodic grating, thermal radiations with two-dimensional (2D) structure effectively enable the nonreciprocity for both TE and TM polarizations, which is significantly valuable to the thermal radiation control and energy collection.