  A standard model is suggested to explore correlation features of two
spatially separated optomechanical cavities. The cavities are coupled through
the photon-hopping process. In particular, we investigate the generation of
entanglement between mechanical resonators in the strong coupling regime and
the two cavities are assumed to be driven by a coherent laser field. In order
to quantify entanglement we use the logarithmic negativity. The analytical
solutions are presented for the system in a parameter regime very close to the
current experimental results. We show that in the presence of the photon
hopping process between the cavities, the two mechanical resonators and the
field modes can be entangled. This shows clearly that the entanglement can be
transfer via radiation pressure of a photon hopping coupling from the
intracavity photon-phonon entanglements to an inter-cavity photon-photon or
phonon-phonon entanglement.
