Composite Spiral Zone Plate Cheng, Shubo ; Xia, Tian ; Liu, Mengsi ; Zheng, Chenglong ; Zang, Huaping ; Tao, Shaohua Abstract Publication: IEEE Photonics Journal Pub Date: February 2019 DOI: 10.1109/JPHOT.2018.2885004 Bibcode: 2019IPhoJ..1185004C