Opt Lett. 2019 Apr 1;44(7):1611-1614. doi: 10.1364/OL.44.001611.
We propose and fabricate a novel ring-core photonic crystal fiber made of a circular ring core surrounded by a cladding constituted of air holes organized in a first circular ring surrounded by hexagonal ones. The fiber efficiently supports four different groups of orbital angular momentum (OAM) modes. The effective indices of spin-orbit aligned and spin-orbit anti-aligned modes in the same OAM modes group are separated by at least 2.13×10 at 1550 nm. The realized fiber is expected to be a good platform for applications involving OAM modes.
我们提出并制作了一种新型的环形芯光子晶体光纤，由一个被六边形环绕的第一环形空气孔组成的包层环绕的圆形环形芯构成。该光纤有效地支持了四组不同的轨道角动量（OAM）模式。在同一 OAM 模式组中，自旋轨道对齐和自旋轨道不对齐模式的有效折射率在 1550nm 处至少相差 2.13×10。所实现的光纤有望成为涉及 OAM 模式的应用的良好平台。
