Fig. 3

PCR and absorptivity calculation of the proposed MFD. a Simulation model. b Calculated results of the PC mode and absorption mode; the results of the structure without AM are also demonstrated for comparison. b The PCR and absorptivity of the structure without AM are plotted as the red curve with solid circle mark and carmine curve with semi-solid circle mark, respectively. For the PC mode of the proposed MFD, the PCR and absorptivity are plotted as the blue curve with solid five-pointed star mark and cyan curve with semi-solid delta mark, respectively. For the absorption mode of the proposed MFD, the absorptivity is plotted as the hidden blue curve with full sphere mark