Localized surface plasmon resonnance induced terahertz broad absorption band

Abstract A broad band metamaterial absorber is designed and simulated, which constitutes by double circular-patterned metal–dielectric stacks. A absorption band is obtained from 14.1 to 16.4 THz. Electric field distributions reveal that the absorption band is obtained from localized surface plasmon (LSP) modes which are excited both on outside and inside edges of each stack, while the high-frequency absorption peak is excited by LSP modes which are excited only on outside edges. The absorption band width can be tuned by increasing the radius ( R ) of circular-patterned layers and reducing the thickness of dielectric layers ( H d ). Moreover, the designed broad band metamaterial absorber is independent of circular-patterned dielectric layer combination.

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