  Solid-state single photon sources (SPSs) with narrow line width play an
important role in many leading quantum technologies. Within the wide range of
SPSs studied to date, single fluorescent molecules hosted in organic crystals
stand out as bright, photostable SPSs with a lifetime-limited optical resonance
at cryogenic temperatures. Furthermore, recent results have demonstrated that
photostability and narrow line widths are still observed from single molecules
hosted in a nanocrystalline environment, which paves the way for their
integration with photonic circuitry. Polymers offer a compatible matrix for
embedding nanocrystals and provide a versatile yet low-cost approach for making
nanophotonic structures on chip that guide light and enhance coupling to
nanoscale emitters. Here, we present a deterministic nanostructuring technique
based on electron-beam lithography for shaping polymers with embedded single
molecules. Our approach provides a direct means of structuring the nanoscale
environment of narrow line width emitters while preserving their emission
properties.
