Fig. 5

a The cross-sectional SEM image of the ITO NWs fabricated on GaN. b The effective refractive index profiles calculated based on the NWs light, which was measured from the cross-sectional SEM image
a The cross-sectional SEM image of the ITO NWs fabricated on GaN. b The effective refractive index profiles calculated based on the NWs light, which was measured from the cross-sectional SEM image