A proposal about a dielectric resonator nanoantenna applied to couple optical beams to a surface plasmon coplanar waveguide (SP CPW), and vice versa, was theoretically investigated. The effects of this device operating in optical frequencies were studied, taking into account the central frequency of the conventional optical communication spectrum (C-band). Numerical results show that this proposal is interesting in that it couples an optical beam with an SP CPW with a good reflection coefficient, gain, and broadside radiation pattern.