LAUSR

Abstract We propose a waveguide system based on the bulk Dirac semimetals material to achieve plasmon-induced absorption (PIA). Numerical results were verified by classical three-level system theory. The absorption window is attributed to the extreme destructive interference of the bright and dark modes. The dynamic controllability of the absorption window modulation ratio is achieved by adjusting the Fermi level. In addition, the plasmonic system is extremely sensitive to environmental refractive indices. In this way, the structure makes the absorption window not only vertically controllable, but also horizontally adjustable. Simultaneously, the group time delay of the PIA window can reach −57.2 ps, which is more advantageous for ultra-fast light devices. Finally, by studying the two-channel PIA waveguide system, more excellent design platforms are provided for optical transmission for practical multi-functional highly integrated plasmonic components.