title: Tunable broad-band perfect absorber by exciting of multiple plasmon resonances at optical frequency.
abstract: A broad-band perfect absorber composing a two-dimensional periodic metal-dielectric-metal sandwiches array on dielectric/metal substrate is designed and numerically investigated. It is shown that the nearly-perfect absorption with a bandwidth of about 50 nm in visible region can be achieved by overlapping of two plasmon resonances: one originating from the coupling of electric dipoles between adjacent unit cells and another arising from magnetic dipole plasmon resonances. A capacitor-inductor circuit description is introduced to explain the dependence of resonance frequencies and band-width on geometrical parameters.
authors: Department of School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China.
authors: Junqiao
authors: J
authors: Wang
authors: Chunzhen
authors: C
authors: Fan
authors: Pei
authors: P
authors: Ding
authors: Jinna
authors: J
authors: He
authors: Yongguang
authors: Y
authors: Cheng
authors: Weiqin
authors: W
authors: Hu
authors: Genwang
authors: G
authors: Cai
authors: Erjun
authors: E
authors: Liang
authors: Qianzhong
authors: Q
authors: Xue