Guo Chaoheng, Fu Shenhe, Lin Haolin, Li Zhen, Yin Hao, Chen Zhenqiang
Opt Express. 2018 Jul 9;26(14):18721-18733. doi: 10.1364/OE.26.018721.
We demonstrate that the spatially diffractive properties of cylindrical vector beams could be controlled via linear interactions with anisotropic crystals. It is the first time to show experimentally that the diffraction of the vector beams can be either suppressed or enhanced significantly during propagation, depending on the sign of anisotropy. Importantly, it is also possible to create a linear non-spreading and shape-preserving vector beam, by vanishing its diffraction during propagation via strong anisotropy in a crystal. The manageable diffractive effect enables manipulating propagation dynamics of the circular Airy vector beams, i.e., their propagation trajectories can be dynamically controlled by weakening or enhancing self-acceleration of the Airy beam. We further demonstrate that the cylindrical vector beams with initially zero orbital angular momentum can be rotated either clockwise or anticlockwise, relying on the sign of the anisotropy.
我们证明，圆柱矢量光束的空间衍射特性可以通过与各向异性晶体的线性相互作用来控制。这是首次通过实验表明，矢量光束在传播过程中的衍射可以根据各向异性的符号显著抑制或增强。重要的是，通过晶体中的强各向异性使其在传播过程中衍射消失，还可以创建线性非扩展且形状保持的矢量光束。这种可控的衍射效应能够操纵圆形艾里矢量光束的传播动力学，即通过减弱或增强艾里光束的自加速，可以动态控制其传播轨迹。我们进一步证明，初始轨道角动量为零的圆柱矢量光束可以根据各向异性的符号顺时针或逆时针旋转。
