Wang Junqiao, Fan Chunzhen, Ding Pei, He Jinna, Cheng Yongguang, Hu Weiqin, Cai Genwang, Liang Erjun, Xue Qianzhong
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.
Opt Express. 2012 Jul 2;20(14):14871-8. doi: 10.1364/OE.20.014871.
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.
设计并数值研究了一种由二维周期性金属-电介质-金属三明治阵列构成的宽带完美吸收体，该阵列位于电介质/金属衬底上。结果表明，通过两个等离子体共振的重叠，在可见光区域可实现带宽约为50nm的近乎完美的吸收：一个源于相邻单元之间电偶极子的耦合，另一个源于磁偶极子等离子体共振。引入了电容-电感电路描述来解释共振频率和带宽对几何参数的依赖性。
