Edge-oriented and steerable hyperbolic polaritons in anisotropic van der Waals nanocavities.
Zhigao Dai, Guangwei Hu, Guangyuan Si, Qingdong Ou, Qing Zhang, Sivacarendran Balendhran, Fahmida Rahman, Bao Yue Zhang, Jian Zhen Ou, Guogang Li, Andrea Alù, Cheng-Wei Qiu, Qiaoliang Bao
Nature Communications | Nature Research (part of Springer Nature) | Published : 2020
Highly confined and low-loss polaritons are known to propagate isotropically over graphene and hexagonal boron nitride in the plane, leaving limited degrees of freedom in manipulating light at the nanoscale. The emerging family of biaxial van der Waals materials, such as α-MoO3 and V2O5, support exotic polariton propagation, as their auxiliary optical axis is in the plane. Here, exploiting this strong in-plane anisotropy, we report edge-tailored hyperbolic polaritons in patterned α-MoO3 nanocavities via real-space nanoimaging. We find that the angle between the edge orientation and the crystallographic direction significantly affects the optical response, and can serve as a key tuning parame..View full abstract
Awarded by National Natural Science Foundation of China (National Science Foundation of China)
The authors acknowledge the support from the National Natural Science Foundation of China (No. 51601131), the National Key Research & Development Program (No. 2016YFA0201900), ARC (FT150100450, CE170100039 and IH150100006), the International Postdoctoral Exchange Fellowship Program and the Shenzhen Nanshan District Pilotage Team Program (LHTD20170006). C.-W.Q. acknowledges financial support from A*STAR Pharos Program (grant number 15270 00014, with project number R-263000-B91-305) and the National Research Foundation, Prime Minister's Office, Singapore under Competitive Research Program Award NRF-CRP22-2019-0006. Q.O. and Q.B. acknowledge support from the Australian Research Council Center of Excellence in Future Low-Energy Electronics Technologies (FLEET). A.A. acknowledges support from the Air Force Office of Scientific Research. G.S. acknowledges support from the Natural Science Foundation of Hebei Province (Grant No. F2018501063), Z.D. acknowledges support from the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (No. 162301202610).