Departamento de Ciencia de Materiales, Optica y Technología Electrónica, Universidad Miguel Hernández, E03202 Elche, Spain.
Opt Lett. 2009 Oct 1;34(19):2927-9. doi: 10.1364/OL.34.002927.
We demonstrate a specially designed vortex sensing diffraction grating that generates multiple vortex patterns in the different diffracted orders. When this grating is illuminated with a separate vortex beam, the sign and order of the topological charge of the incident beam can be easily detected. Experimental results are shown for a variety of vortex beams including fractional values of the topological charge, and where both the diffraction grating and incident vortex illumination beam are generated by two different liquid crystal displays (LCDs). The programmability offered by the LCDs offers extremely convenient flexibility.
我们展示了一种特殊设计的涡旋传感衍射光栅，它在不同的衍射级中产生多个涡旋模式。当该光栅被单独的涡旋光束照射时，可以很容易地检测到入射光束的拓扑电荷的符号和阶数。实验结果展示了各种涡旋光束，包括拓扑电荷的分数值，并且衍射光栅和入射涡旋照明光束都是由两个不同的液晶显示器（LCD）产生的。LCD 提供的可编程性提供了极其方便的灵活性。
