Faculdade de Tecnologia, Servicio Nacional de Aprendizagem Industrial SENAI-Cimatec,Avenida Orlando Gomes 1845 41650-010, Salvador, Bahia, Brazil.
Opt Lett. 2009 Dec 1;34(23):3641-3. doi: 10.1364/OL.34.003641.
A wave propagation analysis carried out in two kinds of q-plates having topological unit charge (1-plates), one plate with a radial orientation of the optical axis and the other with an azimuthal one, reveals that these devices admit nondiffracting Bessel beams as exact solutions of the vector Helmholtz's equation. The phase shifts between the ordinary and the extraordinary waves in both structures were found to be different. The polarization-scrambling term in the Helmholtz equation is responsible for such differences, emphasizing that this term cannot be dropped in radial plates, contrary to the azimuthal case. A phase shift analysis suggests that these plates are relevant for the control of nonconventional polarization states of light. In this way, a novel redistribution of the spin-orbital angular momentum of these nondiffracting beams passing by the 1-plate is demonstrated, which could be useful for applications in classic and quantum regimes.
在两种具有拓扑电荷（1 板）的 q 板中进行的波传播分析，一个板的光轴具有径向取向，另一个板具有角向取向，结果表明这些器件可以作为矢量亥姆霍兹方程的精确解来实现无衍射贝塞尔光束。发现这两种结构中的寻常波和非寻常波之间的相移是不同的。亥姆霍兹方程中的偏振混频项是造成这种差异的原因，强调在径向板中不能忽略这个项，而在角向情况下则可以忽略。相移分析表明，这些板对于控制光的非常规偏振状态是很重要的。通过这种方式，证明了这些无衍射光束通过 1 板时的自旋轨道角动量的一种新的再分配，这对于经典和量子领域的应用可能是有用的。
