Abstract
Anisotropic hyperbolic phonon polaritons(PhPs)in natural biaxial hyperbolic material α-MoO3 has opened up new avenues for mid-infrared nanophotonics,while active tunability of α-MoO3 PhPs is still an urgent problem necessarily to be solved.In this study,we present a theoretical demonstration of actively tuning α-MoO3 PhPs using phase change material VO2 and graphene.It is observed that α-MoO3 PhPs are greatly dependent on the propagation plane angle of PhPs.The insulator-to-metal phase transition of VO2 has a significant effect on the hybridization PhPs of the α-MoO3NO2 structure and allows to obtain actively tunable α-MoO3 PhPs,which is especially obvious when the propagation plane angle of PhPs is 90°.Moreover,when graphene surface plasmon sources are placed at the top or bottom of α-MoO3 in α-MoO3/VO2 structure,tunable coupled hyperbolic plasmon-phonon polaritons inside its Reststrahlen bands(RBs)and surface plasmon-phonon polaritons outside its RBs can be achieved.In addition,the above-mentioned α-MoO3-based structures also lead to actively tunable anisotropic spontaneous emission(SE)enhancement.This study may be beneficial for realization of active tunability of both PhPs and SE of α-MoO3,and facilitate a deeper understanding of the mechanisms of anisotropic light-matter interaction in α-MoO3 using functional materials.
基金项目
国家自然科学基金(52204258)
国家自然科学基金(52106099)
Postdoctoral Research Foundation of China(2023M743779)
中央高校基本科研业务费专项(2022QN1017)
Key Research Development Projects in Xinjiang Uygur Autonomous Region(2022B03003-3)
山东省自然科学基金(ZR2020LLZ004)
万方数据