LAUSR

In this paper, we propose a kind of multi-functional all-dielectric metamaterial (ADMM), which is composed of vanadium dioxide (VO 2 ), silicon, and silicon dioxide. Two functions of polarization conversion and wave absorption are realized by using the phase change characteristics of VO 2 . When the VO 2 is in the insulating state, the structure has the function of transmission polarization conversion and realizes the conversion from line-polarized wave to cross-polarized wave. The polarization conversion rate (PCR) is more than 95% in 250-nm bandwidth. The reason of the high PCR is analyzed from the perspective of the amplitude and phase of the field component. The first-order Mie resonance is found by looking at the distribution of electric field. When the VO 2 is in the metallic state, the structure has the absorption function. Within the bandwidth of 482 nm, the absorption efficiency is more than 80%. By looking at the distribution of electric field and magnetic field, the main reason for the strong absorption effect is explained. Finally, the effect of VO 2 conductivity on performance was studied.