Efficient interaction of light with quantum emitters is crucial for most applications in nano and
quantum technologies. In the last decade, great progresses in the field have been possible by exploiting
hybrid interfaces. In this context, we provide experimental proofs of the efficient coupling of single
organic molecules to confined electromagnetic modes in photonic devices.
Dibenzoterrylene molecules in anthracene crystals (DBT:Ac) are particularly suitable quantum
systems for this task, due to outstanding photophysical properties in crystals as thin as few tens
of nanometers: long-term photostability , lifetime-limited emission in the zero phonon line at
cryogenic temperatures [2, 3], operating wavelength in the near-infrared at 780 nm. Building on the
advantages of all-solid-state systems, we demonstrate that our platform allows effective single photon
sources specifically coupled to confined radiation modes and opens the pathways to the realization
of localized optical nonlinearities at the single-photon level[4, 5].
A versatile planar optical antenna-like structure is demonstrated , which strongly
directs the radiation of the molecule into a narrow pattern (20o-wide semicone), thus enabling
considerably effective mode-matching with an external gaussian beam. We also report on our results
about fluorescence coupling to a single-mode dielectric waveguide  and discuss the integration of
single quantum emitters into hybrid dielectric-plasmonic devices , with respect to the
realization of optical transistors in the low light regime. Competitive collection efficiencies, free
from interconnection losses , candidate the system for scalable approaches to on-chip quantum
computation . Eventually, we report on current efforts to integrate molecular crystals in polymer-
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