Prospects for giant optical nonlinearity on a chip
  We point out that individual organic dye molecules, deposited close to optical waveguides on a photonic chip, can act as single photon sources and can also provide localised, giant optical nonlinearities. This new atom-photon interface may be used as a resource for processing quantum information. 
Jaesuk Hwang, E. A. Hinds
quant-ph physics.atom-ph