论文标题
第二次谐波生成的参数激发时间变化的元时间
Parametrically Excited Time-varying Metasurfaces for Second Harmonic Generation
论文作者
论文摘要
参数振荡是一个基本的基本概念，其基础是非线性波 - 物质相互作用，从而导致新频率成分的产生或扩增。使用控制直流电流（DC）电场和光场的杂项干扰产生的时间调制，我们共同驱动了无定形硅元原子的大振幅振荡 - 光学元图的纳米级构建块。我们观察到了巨大增强的第二次谐波生成（SHG），其电场控制的OFF比率超过10000，并且超高调制深度为每伏405。一个涉及时间依赖共振的简单MATHIEU方程捕获了实验数据的大多数特征（例如，SHG强度具有超季度DC字段依赖性），并通过参数调制为SHG效率提高提供了见解。我们的工作提供了一种紧凑的，电动可调和CMOS（互补的金属氧化物半导体），可兼容的方法来增强和动态控制芯片上的非线性光代。它具有在光学通信和信号处理中应用的巨大潜力。
Parametric oscillation is a fundamental concept that underlies nonlinear wave-matter interactions, leading to generation or amplification of new frequency components. Using a temporal modulation generated by the heterodyne interference of a control direct current (dc) electric field and an optical field, we resonantly drive large-amplitude oscillations of amorphous silicon meta-atoms - nanoscale building blocks of an optical metasurface. We observed gigantically enhanced second harmonic generation (SHG) with an electric-field-controlled on off ratio over 10000 and an ultra-high modulation depth of 405 per volt. A simple Mathieu equation involving a time-dependent resonance captures most features of experiment data (for example, SHG intensity has super-quadratic dc field dependence), and provides insight into SHG efficiency enhancement through parametric modulations. Our work provides a compact, electric-tunable and CMOS (Complementary Metal-Oxide Semiconductor) compatible approach to boosting and dynamically controlling nonlinear light generations on a chip. It holds great potential for applications in optical communications and signal processing.
