Modifying Spontaneous Emission Spectra by Using Split Rings

We propose a scheme to modify spontaneous emission spectra with split rings. We consider the heterogeneous environment around the dipole and the dipole as a whole to comprehensively explore the impact of the parameters of the system on the partial local density of state. And we achieve the customization of spontaneous emission spectra by engineering the partial local density of state with the co-design of split rings and dipoles for different applications. The finite-difference time-domain numerical results show that our approach is in line with theoretical expectations.