Second-order nonlinear optical metamaterials: ABC-type nanolaminates
Second-order nonlinear optical metamaterials: ABC-type nanolaminates
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DOI：
10.1063/1.4931492
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发表时间：
2015-09-21
影响因子：
4
通讯作者：
Koos, C.
中科院分区：
文献类型：
--
作者：
Alloatti, L.;Kieninger, C.;Koos, C.
我们展示了一种二阶非线性超材料的概念，这种材料可以从具有固有低光吸收的非金属中心对称成分中获得。这个概念是基于三种不同材料的迭代原子层沉积，A = Al2O3, B = TiO2和C = HfO2。由于ABC和反向CBA序列不相等，因此所得到的ABC堆栈的中心对称性被打破——这是非零二阶非线性的必要条件。在我们的实验中，我们发现体的二阶非线性磁化率取决于界面的密度，导致在800 nm波长处的非线性磁化率为0.26 pm/V。abc型纳米层合材料几乎可以沉积在任何衬底上，为红外和可见光二阶非线性光学工程提供了一条有前途的途径。(C) 2015 AIP出版有限责任公司
We demonstrate a concept for second-order nonlinear metamaterials that can be obtained from non-metallic centrosymmetric constituents with inherently low optical absorption. The concept is based on iterative atomic-layer deposition of three different materials, A = Al2O3, B = TiO2, and C = HfO2. The centrosymmetry of the resulting ABC stack is broken since the ABC and the inverted CBA sequences are not equivalent-a necessary condition for non-zero second-order nonlinearity. In our experiments, we find that the bulk second-order nonlinear susceptibility depends on the density of interfaces, leading to a nonlinear susceptibility of 0.26 pm/V at a wavelength of 800 nm. ABC-type nanolaminates can be deposited on virtually any substrate and offer a promising route towards engineering of second-order optical nonlinearities at both infrared and visible wavelengths. (C) 2015 AIP Publishing LLC.