Photonic Spin-Multiplexing Metasurface for Switchable Spiral Phase Contrast Imaging Huo, Pengcheng ; Zhang, Cheng ; Zhu, Wenqi ; Liu, Mingze ; Zhang, Song ; Zhang, Si ; Chen, Lu ; Lezec, Henri J. ; Agrawal, Amit ; Lu, Yanqing ; Xu, Ting Abstract Publication: Nano Letters Pub Date: April 2020 DOI: 10.1021/acs.nanolett.0c00471 Bibcode: 2020NanoL..20.2791H