Actively tuning anisotropic light-matter interaction in biaxial hyperbolic material $\hat{I}\pm$-MoO${}_3$ using phase change material VO${}_2$ and graphene

Abstract

Anisotropic hyperbolic phonon polaritons (PhPs) in natural biaxial hyperbolic material MoO${}_3$ has opened up new avenues for mid-infrared nanophotonics, while active tunability of $\hat{I}\pm$-MoO${}_3$ PhPs is still an urgent problem needing to be solved.In this study, we present a theoretical demonstration of actively tuning $\hat{I}\pm$-MoO${}_3$ PhPs using phase change material VO${}_2$ and graphene. It is observed that $\hat{I}\pm$-MoO${}_3$ PhPs are greatly depending on the propagation plane angle of PhPs. The metal-to-insulator phase transition of VO${}_2$ has a significant effect on the hybridization PhPs of the $\hat{I}\pm$-MoO${}_3$/VO${}_2$ structure and allows to obtain an actively tunable $\hat{I}\pm$-MoO${}_3$ PhPs, which is especially obvious when the propagation plane angle of PhPs is 90.