  The goal of nanophotonics is to control and manipulate light at length scales
below the diffraction limit. Typically nanostructured metals are used for this
purpose, light being confined by exploiting the surface plasmon-polaritons such
structures support. Recently excitonic (molecular) materials have been
identified as an alternative candidate material for nanophotonics. Here we use
theoretical modelling to explore how hybridisation of surface
exciton-polaritons can be achieved through appropriate nanostructuring. We
focus on the extent to which the frequency of the hybridised modes can be
shifted with respect to the underlying material resonances.
