  High quality factor dielectric cavities designed to a nanoscale accuracy are
mostly used to increase the spontaneous emission rate of a single emitter. Here
we show that the coupling, at room temperature, between thick shell CdSe/CdS
nanocrystals and random metallic films offers a very promising alternative
approach. Optical modes confined at the nanoscale induce strong Purcell factors
reaching values as high as 60. Moreover the quantum emission properties can be
tailored: strong antibunching or radiative biexcitonic cascades can be obtained
with high photon collection efficiency and extremely reduced blinking.

Mesoscale and Nanoscale Physics