Hole size dependence of forward emission from organic dyes coated with two-dimensional metallic arrays

The effects of hole size on the forward emission from organic dyes coated with two-dimensional Au hole arrays have been studied by angle-dependent reflectivity and photoluminescence. It is found that when the hole radius increases from 73 to 116 nm, the emission intensity and bandwidth are enhanced by 2.5 and 2 times, respectively. By correlating the photoluminescence and reflectivity mappings, we have attributed the enhancement of emission primarily to the increase in radiation coupling efficiency to surface plasmons and surface plasmon radiative decay rate.