As for GSP, its magnetic field distribution (Fig. ) at the resonance wavelength shows the prototypical magnetic dipole generated by the strong field confinement between the Au nanodisk and the back reflector. Figure depicts the optical power loss, highlighting the distribution of energy dissipation, which is predominantly governed by the CP spacer due to the lossy nature of insulating EB. This emphasizes the critical role of the CP spacer in modulating the optical response of the metasurface, where its lossy dielectric properties enhance light absorption through mechanisms such as AFP cavity and GSP resonance. It is worth noting that GSP resonance can also be observed in isolated CP spacer, where AFP absorption is absent (Supplementary Fig. ).