The emission of light from silver gratings coated with dye monolayer assemblies is reported for the first time. The monolayer assembly was laid down by the Langmuir-Blodgett dipping technique. When the grating is illuminated with s- or p-polarized light, weak fluorescence from the dye monolayer is detected. In addition there is emission of light from all plasmon surface polariton modes with energy lower than that of the exciting light. This latter emission is identified by a characteristic polarization and dependence of wavelength on angle of emission in the plane perpendicular to the grooves of the grating. At energies within the absorption bands of the dye monolayer, this emission is shown to be enhanced. © 1981 American Institute of Physics.