Self-suspended rare-earth doped up-conversion luminescent waveguide: propagating and directional radiation Journal title: Opto-Electronic Advances Authors: Changjian Zhang, Chengyun Zhang, Zhenglong Zhang*, Tao He, Xiaohu Mi, Ting Kong, Zhengkun Fu, Hairon... Subject(s): Electrical and Electronic Engineering, Engineering, Nanotechnology, Technology, Remote Sensing, Optics