Realization of polarization evolution on higher-order Poincare sphere   with metasurface
  We present a simple and convenient method to yield cylindrical vector (CV) beams and realize its polarization evolution on higher-order Poincare sphere based on inhomogeneous birefringent metasurface. By means of local polarization transformation of the metasurface, it is possible to convert a light beam with homogeneous elliptical polarization into a vector beam with any desired polarization distribution. The Stokes parameters of the output light are measured to verify our scheme, which show well agreement with the theoretical prediction. Our method may provide a convenient way to generate CV beams, which is expected to have potential applications in encoding information and quantum computation. 
Yachao Liu, Xiaohui Ling, Xunong Yi, Xinxing Zhou, Hailu Luo, and   Shuangchun Wen
physics.optics