论文标题
通过平面倒置对称性损坏的光子晶体平板的Decalized Bloch模式，将Valley光子路由在WS2单层中的路由
Routing of valley photons in a WS2 monolayer via delocalized Bloch modes of in-plane inversion-symmetry broken photonic crystal slabs
论文作者
论文摘要
二维过渡金属二核苷（TMDC）的山谷为信息处理提供了新的自由度。一方面，通过利用不同的外部刺激（例如光场和电场）来控制山谷，可以利用这个山谷的自由度。另一方面，纳米结构还用于通过近场耦合来分离山谷。但是，对于上述两种方法，都需要低温环境或低度的相干性能限制了其进一步的应用。在这里，我们演示了没有面内反转对称性（C2对称性）的全丝电光子晶体（PHC）平板，可以在室温下在WS2单层中分离并在WS2单层中将其路由。与此类PHC平板的圆极化光子BLOCH模式结合，WS2单层发射的谷光子在远场上方向有效地分离。另外，远场发射在方向上增强，并具有长距离的空间相干性能。
The valleys of two-dimensional transition metal dichalcogenides (TMDCs) offer a new degree of freedom for information processing. To take advantage of this valley degree of freedom, on one hand, it is feasible to control valleys by utilizing different external stimuli like optical and electric fields. On the other hand, nanostructures are also used to separate the valleys by near field coupling. However, for both above methods, either required low-temperature environment or low degree of coherence properties limit their further applications. Here, we demonstrate all-dielectric photonic crystal (PhC) slabs without in-plane inversion symmetry (C2 symmetry) could separate and route valley photons in a WS2 monolayer at room temperature. Coupling with circularly polarized photonic Bloch modes of such PhC slabs, valley photons emitted by a WS2 monolayer are routed directionally and efficiently separated in the far field. In addition, the far-field emission is directionally enhanced and with long-distance spatial coherence property.
