论文标题
具有拓扑保护
Local orbital-angular-momentum dependent surface states with topological protection
论文作者
论文摘要
沿蜂窝晶格中谷光子晶体的曲折边缘的手性表面状态显示出来。通过将局部场分解为轨道角动量（OAM）模式，我们发现手性表面状态具有OAM依赖性的单向传播特征。特别是，表面状态的传播缔立通过局部OAM分解来量化，并被发现取决于源和表面状态的手势。这些发现允许对电磁能的单向传播进行工程控制，而无需辅助覆层层。此外，我们检查了手性表面状态在急转弯的繁殖中的传播。事实证明，尽管只有某些状态成功地通过了弯曲，但由于结构的拓扑结构，单向传播得到了很好的维护。
Chiral surface states along the zigzag edge of a valley photonic crystal in the honeycomb lattice are demonstrated. By decomposing the local fields into orbital angular momentum (OAM) modes, we find that the chiral surface states present OAM-dependent unidirectional propagation characteristics. Particularly, the propagation directivities of the surface states are quantified by the local OAM decomposition and are found to depend on the chiralities of both the source and surface states. These findings allow for the engineering control of the unidirectional propagation of electromagnetic energy without requiring an ancillary cladding layer. Furthermore, we examine the propagation of the chiral surface states against sharp bends. It turns out that although only certain states successfully pass through the bend, the unidirectional propagation is well maintained due to the topology of the structure.
