自由载流子吸收
免费承运人
色散(光学)
折射率
材料科学
吸收(声学)
载流子寿命
光学
光电子学
分子物理学
硅
化学
物理
复合材料
作者
Marco Novarese,Sebastián Romero-García,Jock Bovington,Mariangela Gioannini
出处
期刊:IEEE Photonics Technology Letters
[Institute of Electrical and Electronics Engineers]
日期:2023-04-15
卷期号:35 (8): 450-453
被引量:1
标识
DOI:10.1109/lpt.2023.3255299
摘要
We report pump-probe measurements of time resolved optical transmission spectra of Si and Si/poly-Si microrings after high free carrier densities have been generated by two-photon absorption of the pump pulse. From measurements, we can extract the recovery dynamics of free carrier absorption, refractive index dispersion, generated free carriers and finally the effective initial free carrier lifetimes. The method is validated by comparing modelling and simulations with measurements; the obtained results are in very good agreement with what predicted by the Shockley-Read-Hall recombination model for trap assisted recombination. We also propose a method for determining the empirical relations for free carrier absorption and refractive index dispersion in poly-Si waveguides.
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