Löffler W, van Exter M P, 't Hooft G W, Nienhuis G, Broer D J, Woerdman J P
Huygens Laboratory, Leiden University, Leiden, The Netherlands.
Opt Express. 2011 Jul 4;19(14):12978-83. doi: 10.1364/OE.19.012978.
In theory, there are analogous transformations of light's spin and orbital angular momentum [Allen and Padgett, J. Mod. Opt. 54, 487 (2007)]; however, none have been observed experimentally yet. In particular, it is unknown if there exists for the orbital angular momentum of light an effect analogous to the spin angular momentum-based optical rotation; this would manifest itself as a rotation of the corresponding Hermite-Gauss mode. Here we report an experimental search for this effect in a cholesteric liquid crystal polymer, using strongly focussed, spin-orbit coupled light. We find that the relative phase velocities of the orbital modes constituting the Hermite-Gauss mode agree to within 10(-5).
理论上，光的自旋和轨道角动量存在类似的变换[艾伦和帕吉特，《现代光学杂志》54，487（2007）]；然而，尚未有实验观测到。特别地，对于光的轨道角动量是否存在类似于基于自旋角动量的光学旋转的效应尚不清楚；这将表现为相应厄米 - 高斯模式的旋转。在此，我们报告了一项在胆甾型液晶聚合物中使用强聚焦的自旋 - 轨道耦合光对该效应进行的实验研究。我们发现构成厄米 - 高斯模式的轨道模式的相对相速度在10^(-5)范围内相符。
