Manipulate the Dipole Emission Properties Using Highly Symmetrical Nanoantenna

the emission characteristics of an arbitrarily oriented dipole manipulated by a highly symmetrical plasmonic cross nanoantenna are studied under the framework of weak coupling. The theoretical results indicate that, comparing with the conventional dimer counterpart, the average emission enhancement over all the polarizations of the dipole emitter is much higher and the intrinsic polarization of the dipole source is well-preserved in the far field by using the cross configuration. The effect of the substrate and the displacement of the fluorophore are also studied to demonstrate the robustness of the proposed cross structure.