“…A variety of structures, including core-shell 2 , multi-layer heterostructures [3][4][5] , and p-i-n junctions 6,7 , have been implemented specifically for III/V semiconductor NWs by appropriately arranging the growth sequence. Several interesting NW photonic devices have been reported, such as lasers [8][9][10][11] , light-emitters 6 , single photon source 12 , photo-detectors 7 , and wavelength converters 13 . The dimensions of the NWs naturally suggest that NW-based photonic devices are promising for ultrasmall and power-efficient device operation 14 .…”