Bai Zhengyang, Huang Guoxiang, Liu Lixiang, Zhang Shuang
State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China.
School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.
Sci Rep. 2015 Sep 8;5:13780. doi: 10.1038/srep13780.
We propose a method to enhance Kerr nonlinearity and realize low-power gigahertz solitons via plasmon-induced transparency (PIT) in a new type of metamaterial, which is constructed by an array of unit cell consisting of a cut-wire and a pair of varactor-loaded split-ring resonators. We show that the PIT in such metamaterial can not only mimic the electromagnetically induced transparency in coherent three-level atomic systems, but also exhibit a crossover from PIT to Autler-Townes splitting. We further show that the system suggested here also possess a giant third-order nonlinear susceptibility and may be used to create solitons with extremely low generation power. Our study raises the possibility for obtaining strong nonlinear effect of gigahertz radiation at very low intensity based on room-temperature metamaterials.
我们提出了一种方法，通过在一种新型超材料中利用等离激元诱导透明（PIT）来增强克尔非线性并实现低功率千兆赫兹孤子，这种超材料由包含切割线和一对变容二极管加载开口环谐振器的单元阵列构成。我们表明，这种超材料中的PIT不仅可以模拟相干三能级原子系统中的电磁诱导透明，还会展现出从PIT到奥特勒-汤斯分裂的转变。我们进一步表明，这里提出的系统还具有巨大的三阶非线性极化率，可用于以极低的产生功率创建孤子。我们的研究增加了基于室温超材料在极低强度下获得千兆赫兹辐射强非线性效应的可能性。
