Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals
Abstract
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.
Keywords
Cite
@article{arxiv.2201.01412,
title = {Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals},
author = {Yali Zeng and Qingdong Ou and Lu Liu and Chunqi Zheng and Ziyu Wang and Youning Gong and Xiang Liang and Yupeng Zhang and Guangwei Hu and Zhilin Yang and Cheng-Wei Qiu and Qiaoliang Bao and Huanyang Chen and Zhigao Dai},
journal= {arXiv preprint arXiv:2201.01412},
year = {2022}
}