Nonlinear characterization of hydrogenated amorphous silicon waveguides and analysis of carrier dynamics
Nonlinear characterization of hydrogenated amorphous silicon waveguides and analysis of carrier dynamics
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DOI：
10.1063/1.4823579
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发表时间：
2013-09-30
影响因子：
4
通讯作者：
Cristiani, I.
中科院分区：
文献类型：
--
作者：
Lacava, C.;Minzioni, P.;Cristiani, I.
本文测定了氢化非晶硅（a-Si：H）波导的光学非线性系数。到目前为止，在科学文献中报道的类似结构的数据显示出非常大的变化性，其非线性性能的最终评估仍然是一个悬而未决的问题。我们对50多个波导进行了完整和仔细的表征。非线性系数为790 + j20 W-1 m（-1），证实了a-Si：H是一种很好的非线性硅光子器件候选材料。然而，自由载流子动力学表现出在纳秒范围内的复合时间，这可能会阻碍它们在需要高功率光束的超快应用中的开发。(C)2013 AIP Publishing LLC.
In this paper, we determine the optical nonlinear coefficient of hydrogenated amorphous silicon (a-Si: H) waveguides. Up to date, the data reported in the scientific literature for similar structures show a very large variability and the final assessment of their nonlinear performance is still an open issue. We performed a complete and careful characterization of more than 50 waveguides. A nonlinear coefficient of 790 + j20 W-1 m(-1) was found, confirming that a-Si: H is a good candidate for nonlinear silicon photonic devices. Nevertheless, free-carrier-dynamics exhibits a recombination time in the nanosecond range, which can hinder their exploitation in ultrafast applications requiring high-power optical beams. (C) 2013 AIP Publishing LLC.