Tunable near-perfect absorption through interaction between localized surface plasmons modes in optical metamaterials

摘要

A hybrid metamaterial absorber is designed and simulated in 4.0-6.0 mu m region based on temperature sensitive material vanadium dioxide (VO2). A broad absorption band (bandwidth is 0.28 mu m) is achieved based on two local surface plasmon (LSP) modes resonance at room temperature. The effective parameter calculation results indicate that near ideally impedance matching condition is achieved in the absorption band. The absorption band is expanded and shifted to longer resonance wavelength with the lattice constant reducing or the size of central metal particle increasing. Furthermore, new resonant absorption behaviors are achieved through rising the simulated temperature. A new absorption peak is obtained due to the coupled between LSP modes, which are excited on edges of VO2 particles, while the original absorption band is shifted to longer resonance wavelength.