High quality factor nonreciprocal thermal radiation in a weyl semimetal film via the strong coupling between tamm plasmon and defect mode

In this work, we propose a composite multilayer structure consisting of a Weyl semimetal (WS) film and photonic crystal (PC) with a defect layer to achieve nonreciprocal thermal radiation with high quality factor. This high quality factor results from the strong coupling between Tamm plasmon (TP) and defect mode (DM). The quality factor of nonreciprocal thermal radiation can be as high as 221.27 at a wavelength of 9.736 μm. The magnetic field distribution inside the structure and the reflection spectrum of the photonic crystal are also shown, which is beneficial to reveal its physical mechanism. Based on the variation of absorption and emission spectrum with different defect layer thicknesses, the splitting appears in the figure, which proves the strong coupling between Tamm plasmon and defect mode. We believe that these results will provide a new way to realize nonreciprocal thermal radiation applications. • The nonreciprocal thermal radiation from a Weyl semimetal film covered multilayer photonic crystals is investigated. • The quality factor of nonreciprocal thermal radiation can be as high as 221.27 at a wavelength of 9.736 μm. • The high quality factor results from the coupling of Tamm plasmon and defect mode. • This work will provide a new way to realize nonreciprocal thermal radiation utilization based on Weyl semimetals.