Metamaterial as a controllable template for nanoscale field localization
Metamaterial as a controllable template for nanoscale field localization
复制标题
DOI：
10.1063/1.3291675
复制
发表时间：
2010-01-25
影响因子：
4
通讯作者：
Zheludev, N. I.
中科院分区：
文献类型：
--
作者：
Kao, T. S.;Huang, F. M.;Zheludev, N. I.
我们报告，亚波长局域化的光在近场的双周期光子超材料可以有效地控制的偏振和波长的入射辐射。在铝纳米线“鱼鳞”纳米结构附近观察到周期性近场景观的显著变化，包括从孤立的亚波长等离子体激元热点图案到模糊的低对比度图案的过渡，伴随着图案对称性的变化。已经实现了小至0.23 λ的热点，并且已经通过调谐超材料的偶极吸收共振上的入射光的波长来控制它们的位置。偏振态的简单切换可以导致景观图案中的空间周期加倍。
We report that subwavelength localization of light in the near-field of a double-periodic photonic metamaterial may be efficiently controlled by the polarization and wavelength of the incident radiation. A dramatic variation in the periodic near-field landscapes, including a transition from a pattern of isolated subwavelength plasmon hot-spots to a blurred, low contrast pattern, accompanied by a change in the pattern's symmetry has been observed in the proximity of an aluminum nanowire "fish-scale" nanostructure. Hot-spots as small as 0.23 lambda have been achieved and their position has been controlled by tuning the wavelength of incident light across the dipole absorption resonance of the metamaterial. A simple switch of the polarization state can lead to a spatial period doubling in the landscape pattern.