【摘要】 近年来,纳米尺度上范德华材料中声子极化激元的研究因在纳米光子学中的潜在应用而受到广泛关注.这些材料具有亚衍射分辨成像和传感的独特能力,因而成为纳米光子学领域新技术开发的热门途径.尽管声子极化激元材料的研究取得了很多进展,但由于这些材料的绝缘特性,其在实现声子极化激元的动态可逆操纵方面仍然存在挑战.最新研究发现,借助VO₂薄膜,可以实现α-MoO₃中各向异性声子极化激元的可逆操纵.VO₂薄膜是一种近室温相变材料,因其相变前后绝缘态和金属态之间介电性能的巨大变化受到广泛关注.最新的一项研究展示了精心构建的α-MoO₃/VO₂异质结构,改变温度调控VO₂薄膜的介电性能,能够调谐中红外波段极化激元的传播.这些结果展示了一种在纳米尺度上控制光能流动的有效方法,并为集成平面亚衍射激元器件的设计和制造提供了指导.更多还原

【Abstract】 The study of phonon polaritons in van der Waals materials at the nanoscale has gained significant attention in recent years due to its potential applications in nanophotonics. The unique properties of these materials, such as their ability to support sub-diffraction imaging, sensing, and hyperlenses, have made them a promising avenue for the development of new techniques in the field. Despite these advancements, there still exists a challenge in achieving dynamically reversible manipulation of phonon polaritons in these materials due to their insulating properties. In this study, we present experimental results on the reversible manipulation of anisotropic phonon polaritons in a-MoO₃ on top of a VO₂ film, a phasechange material known for its dramatic changes in dielectric properties between its insulating and metallic states. Our findings demonstrate that the engineered VO₂ film enables a switch in the propagation of polaritons in the mid-infrared region by modifying the dielectric properties of the film through temperature changes. Our results represent a promising approach to effectively control the flow of light energy at the nanoscale and offer the potential for the design and fabrication of integrated, flat sub-diffraction polaritonic devices. This study adds to the growing body of work in the field of nanophotonics and highlights the importance of considering phase-change materials for the development of new techniques in this field.更多还原