Fig. 3. Photoluminescence measurements on hybrid nano-emitters.

Single hybrid nanosource based on a Au nanocube and CdSe/CdS/Zn quantum dots embedded within nanometric polymer lobes obtained by plasmonic 2-photon polymerization under ϕ = 45° linear excitation (red arrow). a SEM image of the hybrid plasmonic nanosource with polar coordinates used for discussion. The initial bare nanocube is superimposed to the raw SEM image. b Far-field PL image at polarization angle ϕ = 45°, λ = 405 nm, linear polarization. c PL spectrum. d PL intensity as a function of the angle of polarization of the exciting blue beam. Blue arrows indicate two specific perpendicular polarizations e, f Calculated near-field intensity |E|², λ = 405 nm, mid horizontal section planes, polarizations indicated by blue arrows. Black lines represent the contours of the polymer lobes as deduced from the SEM image (a).