论文标题
有限大小光子晶体模式的拓扑充电
Topological charge of finite-size photonic crystal modes
论文作者
论文摘要
拓扑电荷是远场辐射涡流中心周围极化向量的绕组数量。在这项工作中，理论上使用包膜函数方法对光子晶体模式的拓扑充电进行了分析。发现了一组模式，具有由其非平凡的包膜函数决定的独特极化属性。在实验上，这种模式下的激光操作在具有高坡度效率的电泵送的中红外光子光子晶体表面发射激光器中证明。从单模激光发射的极化特性中直接观察到拓扑电荷。
Topological charges are the winding numbers of polarization vectors around the vortex centers of far-field radiation. In this work, the topological charge of photonic crystal modes is theoretically analyzed using an envelope function approach. A group of modes is discovered with unique polarization properties dictated by their non-trivial envelope functions. Experimentally, lasing operation on such mode is demonstrated in an electrically pumped mid-infrared photonic crystal surface-emitting laser with high slope efficiency. The topological charge is directly observed from the polarization properties of single-mode laser emission.
