A succinct method to generate multi-type HCV beams with a spatial spiral varying retardation-plateJunli Qi, Hui Zhang, Baoguo Pan, Haifei Deng, Jinhong Yang, Bo Shi, Hui Wang, Ang Du, Weihua Wang and Xiujian LiEPL, 121 5 (2018) 54004DOI: https://doi.org/10.1209/0295-5075/121/54004