Fig. 5.

Optical characteristics of the single QD-plasmonic coupled system. (A) Photon-correlation measurement under CW excitation. The red curve was fitted using a second-order coherence function (B) Polar plot of the single QD PL intensity as a function of the polarization direction of the emission. Emissions from QDs are linearly polarized along the <$10\overline{1}0$> direction and have a high polarization ratio ∼0.93, defined as P = (I_max – I_min)/(I_max + I_min), where I_max is the maximum PL intensity and I_min is the minimum PL intensity. This polarization characteristic is also observed in QD emissions without a silver film.