(a) FDTD simulations showing the intensity profile for a 2D-cut along the nanowire growth axis. The integrated intensity at the nanowire end is a factor of 2.7 larger on the Au substrate (right) as compared with the InP substrate (left). The nanowire dimensions are similar to the experimentally investigated nanowires using a tapered nanowire geometry with full-angle of α=2° and nanowire diameter of 200 nm. An in-plane electric dipole emitter is used to represent the quantum dot (QD). (b) Calculated light-extraction efficiency, η, at nanowire end using an NA of 1 for tapered nanowire surrounded by air (black squares) or embedded in PDMS (red circles), both on top of a gold substrate. The absence of the nanowire taper (blue stars) reduces the maximum η through reflections at the nanowire top. The shaded region indicates the range of D/λ used in the present experiments.