Four-wave mixing in photonic crystal waveguides: slow light enhancement and limitations
Four-wave mixing in photonic crystal waveguides: slow light enhancement and limitations
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DOI：
10.1364/oe.19.004458
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发表时间：
2011-02-28
期刊：
影响因子：
3.8
通讯作者：
Krauss, Thomas F.
中科院分区：
文献类型：
--
作者：
Li, Juntao;O'Faolain, Liam;Krauss, Thomas F.
我们证明了连续波四波混频在硅光子晶体波导的396 μ m的长度与群指数n（g）= 30。在90 mW耦合输入泵浦功率下，观察到的最高转换效率为-24 dB。我们要解决的关键问题是，在这个系统中是否确实可以观察到预测的转换效率对减速因子（η近似于S-4）的四次方依赖性，以及在存在传播损耗的情况下，转换效率如何依赖于器件长度。我们发现，预期的相关性举行，只要现实的损失和变化的模式形状与减速因子被考虑在内。在一个简单的分析模型和实验之间取得了很好的一致性之后，我们还预测了可以实现与在纳米线中已经观察到的相同的转换效率的结构，对于相同的输入功率，但是对于短50倍的器件长度。(C)2011年美国光学学会
We demonstrate continuous wave four-wave mixing in silicon photonic crystal waveguides of 396 mu m length with a group index of n(g) = 30. The highest observed conversion efficiency is -24 dB for 90 mW coupled input pump power. The key question we address is whether the predicted fourth power dependence of the conversion efficiency on the slowdown factor (eta approximate to S-4) can indeed be observed in this system, and how the conversion efficiency depends on device length in the presence of propagation losses. We find that the expected dependencies hold as long as both realistic losses and the variation of mode shape with slowdown factor are taken into account. Having achieved a good agreement between a simple analytical model and the experiment, we also predict structures that can achieve the same conversion efficiency as already observed in nanowires for the same input power, yet for a device length that is 50 times shorter. (C) 2011 Optical Society of America