Design and measure of a high-loss transmission band metamaterial filter based on vertical coupling effect between localized surface plasmon modes

A broad band high-loss metamaterial filter with stacked metal–dielectric disks is designed and manufactured. The hybrid plasmonic structure includes two stacked metal disks, a dielectric disk, and a dielectric substrate. A 48 THz high-loss band is obtained in experiments. The vertical coupling effect between localized surface plasmon (LSP) resonant modes excited on the edges of two stacked metal disks leads to the 18 THz high-loss band. It is found that the effective impedance is mismatched to the free space based on the effective medium parameters calculation results. The experimental study also reveals that the high-loss bandwidth is nearly linear increased and the central frequency is nearly linear reduced with the diameter of particles increasing. An equivalent LC circuit model is proposed to explain the changes in bandwidth and central frequency.