Free Carrier Front Induced Indirect Photonic Transitions: A New Paradigm for Frequency Manipulation on Chip
Free Carrier Front Induced Indirect Photonic Transitions: A New Paradigm for Frequency Manipulation on Chip
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DOI：
10.1021/acsphotonics.7b00750
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发表时间：
2017-11-01
期刊：
影响因子：
7
通讯作者：
Eich, Manfred
中科院分区：
文献类型：
--
作者：
Gaafar, Mahmoud A.;Petrov, Alexander Yu.;Eich, Manfred
非线性简并四波混频和交叉相位调制是硅基片上实现全光频率操纵的有效方法。这些方法需要泵浦、信号和闲频的精确群速度和/或相速度匹配。另一方面，最近提出了一些实验演示，其中光的频率被在硅波导中传播的自由载流子波前改变。这种类似多普勒的效应鲜为人知，但对于芯片上的频率操纵具有重要的优势。它不需要相速度匹配，并且不依赖于泵浦脉冲的形状和持续时间。它还允许分组交换，并且可以在泵浦功率独立的机制中操作。在这里，我们简要地回顾了硅慢光波导中的正面诱导间接跃迁的工作。我们考虑三种可能的相互作用制度：通过前面的传输，从前面的反射，并与前面移动称为冲浪。我们推导出一个线性上升沿，这提供了一个统一的描述，在所有三个政权的频率偏移的前面的分析方程。最后，我们比较了基于交叉相位调制和四波混频等非线性效应的前诱导动态频率转换和频移。
Nonlinear degenerate four wave mixing and cross phase modulation are established approaches for all optical frequency manipulation in a silicon chip. These approaches require exact group velocity and/or phase velocity matching of pump, signal, and idler. On the other hand, several experimental demonstrations were presented recently, where frequency of light was changed by a free carrier front propagating in a silicon waveguide. This Doppler-like effect is less known, but has important advantages for frequency manipulation on chip. It requires no phase velocity matching and is not dependent on the shape and duration of the pump pulse. It also allows packet switching and can operate in a pump power independent regime. Here, we shortly review the work on front induced indirect transitions in silicon slow light waveguides. We consider three possible interaction regimes: transmission through the front, reflection from the front, and moving with the front called surfing. We derive analytical equations for the front with a linearly rising edge, which provide a unified description of the frequency shift in all three regimes. Finally, we compare the front induced dynamic frequency conversion to the frequency shifting based on nonlinear effects like cross-phase modulation and four wave mixing.