Artificial Nonlinearity Generated from Electromagnetic Coupling Metamolecule.
Artificial Nonlinearity Generated from Electromagnetic Coupling Metamolecule.
复制标题
DOI：
10.1103/physrevlett.118.167401
复制
发表时间：
2017-04
影响因子：
8.6
通讯作者：
Y. Wen;Ji Zhou
中科院分区：
文献类型：
--
作者：
Y. Wen;Ji Zhou
提出了一种基于超材料路径的纯人工光学非线性机制。该机制是从超分子中的经典电磁相互作用导出的，该超分子由嵌套在分裂环超原子中的切割线超原子组成。在裂环元原子中的局域磁场的作用下，磁场力驱动切割丝元原子中的自由电子发生非谐振荡，产生本征非线性电磁响应。一个显式的二阶非线性行为的物理过程，充分描述，这是完美的一系列数值模拟证明。这种新的光学非线性机制不是从天然非线性材料中“借用”，而是人为地由超分子几何结构所支配，具有前所未有的设计自由度，为非线性光学的研究和应用提供了诱人的可能性。
A purely artificial mechanism for optical nonlinearity is proposed based on a metamaterial route. The mechanism is derived from classical electromagnetic interaction in a metamolecule consisting of a cut-wire meta-atom nested within a split-ring meta-atom. Induced by the localized magnetic field in the split-ring meta-atom, the magnetic force drives an anharmonic oscillation of free electrons in the cut-wire meta-atom, generating an intrinsically nonlinear electromagnetic response. An explicit physical process of a second-order nonlinear behavior is adequately described, which is perfectly demonstrated with a series of numerical simulations. Instead of "borrowing" from natural nonlinear materials, this novel mechanism of optical nonlinearity is artificially dominated by the metamolecule geometry and possesses unprecedented design freedom, offering fascinating possibilities to the research and application of nonlinear optics.