Weyl semimetal emitter enabling TE-polarized wide-angle nonreciprocal thermal radiation

Wide-angle nonreciprocal thermal radiation that deviates from Kirchhoff's law over a broad angular range is relevant for energy harvesting and thermal management. Although wide-angle nonreciprocity for TM-polarized waves has been demonstrated, a comparable effect for TE polarization remains challenging due to reciprocity constraints. A TE-polarized nonreciprocal thermal emitter composed of a Ge grating, Weyl semimetal, and a planar Ag layer is proposed. High emission and low absorption for TE polarization across the azimuthal range from 20^\circ to 80^\circ with nonreciprocity exceeding 0.7 can be obtained. The results indicate that the emitter maintains consistent emission despite dimensional variations, demonstrating favorable fabrication tolerance. The TE-polarized wide-angle nonreciprocity remains stable against minor fluctuations in temperature and axial vector. This proposed approach extends nonreciprocal thermal radiation beyond TM polarization while providing flexibility in wide-angle emission control. It has potential in nonreciprocal radiative cooling, thermophotovoltaics, and infrared technologies.