极化子
电介质
范德瓦尔斯力
纳米光子学
材料科学
声子
凝聚态物理
衍射
各向异性
表面声子
极地的
纳米技术
光电子学
物理
光学
量子力学
分子
作者
Qing Zhang,Qingdong Ou,Guangwei Hu,Jingying Liu,Zhenhong Dai,Michael S. Fuhrer,Qiaoliang Bao,Cheng‐Wei Qiu
出处
期刊:Nano Letters
[American Chemical Society]
日期:2021-03-25
卷期号:21 (7): 3112-3119
被引量:80
标识
DOI:10.1021/acs.nanolett.1c00281
摘要
Surface phonon polaritons (SPhPs) in polar dielectrics offer new opportunities for infrared nanophotonics due to sub-diffraction confinement with low optical losses. Though the polaritonic field confinement can be significantly improved by modifying the dielectric environment, it is challenging to break the fundamental limits in photon confinement and propagation behavior of SPhP modes. In particular, as SPhPs inherently propagate isotropically in these bulk polar dielectrics, how to collectively realize ultra-large field confinement, in-plane hyperbolicity and unidirectional propagation remains elusive. Here, we report an approach to solve the aforementioned issues of bulk polar dielectric's SPhPs at one go by constructing a heterostructural interface between biaxial van der Waals material (e.g., MoO3) and bulk polar dielectric (e.g., SiC, AlN, and GaN). Due to anisotropy-oriented mode couplings at the interface, the hybridized SPhPs with a large confinement factor (>100) show in-plane hyperbolicity that has been switched to the orthogonal direction as compared to that in natural MoO3. More interestingly, this proof of concept allows steerable, angle-dependent and unidirectional polariton excitation by suspending MoO3 on patterned SiC air cavities. Our finding exemplifies a generalizable framework to manipulate the flow of nano-light and engineer unusual polaritonic responses in many other hybrid systems consisting of van der Waals materials and bulk polar dielectrics.
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