Giant enhancement of optical nonlinearity in multilayer metallic films
Giant enhancement of optical nonlinearity in multilayer metallic films
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DOI：
10.1063/1.2175477
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发表时间：
2006-03
影响因子：
3.2
通讯作者：
Jiping Huang;L. Dong;K. Yu
中科院分区：
文献类型：
--
作者：
Jiping Huang;L. Dong;K. Yu
解析地导出了弱非线性多层金属薄膜内部的局域电场，并由此计算了多层结构的有效线性介电常数和三阶非线性极化率。随着层数的增加，与以前的梯度金属膜的结果比较显示出从尖锐的峰逐渐过渡到宽的连续带。这些结果进一步证明了最近报道的新出现的吸收带[J.P.Huang和K. W. Yu，Appl. Phys. Lett. 85，94（2004）]。因此，多层金属膜可以作为光学材料，具有巨大的增强的光学非线性和大的品质因数。
The local electric field has been derived analytically inside multilayer metallic films with weak nonlinearity, and hence the effective linear dielectric constant and third-order nonlinear susceptibility of the layered structures are calculated. As the number of layers increases, the comparison with the previous results of graded metallic films shows a gradual transition from sharp peaks to a broad continuous band. These results give further evidence of the emerging absorption band reported recently [J. P. Huang and K. W. Yu, Appl. Phys. Lett. 85, 94 (2004)]. Thus, multilayer metallic films can serve as optical materials with a giant enhancement of optical nonlinearity and a large figure of merit.