Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals

分类： 光学 >> 量子光学 提交时间： 2023-02-19

Yali Zeng Qingdong Ou Lu Liu Chunqi Zheng Ziyu Wang Youning Gong Xiang Liang Yupeng Zhang Guangwei Hu Zhilin Yang Cheng-Wei Qiu Qiaoliang Bao Huanyang Chen Zhigao Dai

摘要： Polaritons in polar biaxial crystals with extreme anisotropy offer a promising route to manipulate nanoscale light-matter interactions. The dynamical modulation of their dispersion is great significance for future integrated nano-optics but remains challenging. Here, we report a momentum-directed strategy, a coupling between the modes with extra momentum supported by the interface and in-plane hyperbolic polaritons, to tailor topological transitions of anisotropic polaritons in biaxial crystals. We experimentally demonstrate such tailored polaritons at the interface of heterostructures between graphene and {\alpha}-phase molybdenum trioxide ({\alpha}-MoO3). The interlayer coupling can be electrically modulated by changing the Fermi level in graphene, enabling a dynamic topological transition. More interestingly, we found that the topological transition occurs at a constant Fermi level when tuning the thickness of {\alpha}-MoO3. The momentum-directed strategy implemented by interface engineering offers new insights for optical topological transitions, which may shed new light for programmable polaritonics, energy transfer and neuromorphic photonics.

同行评议状态:待评议

 点击量 199  下载量 22  评论 0