I want to extract a Purcell effect by nanoparticles in a plasmonic array, the structure is similar to a below image.
3D FDTD Solutions model of solar cell device consisting of a periodic array of silver nanoparticles located on the upper surface of the silicon solar cell.
Referring to this KB page, I figured it’s not physically meaningful to apply a dipole source to the plasmonic array with periodic BCs, because the dipole source is also periodically arranged and irradiating in an array manner. What If I applied PML BCs in x/y-axes to the plasmonic device as the suggestion in the page, at least how many particles (unit structure) would be putting into the FDTD simulation box with respect to the incident wavelength of the dipole source? Or is there more simpler method to evaluate the Purcell effect in the plasmonic array?
I really appreciate any help you can provide.