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Enhancement of ultrafast nonlinear optical response of silicon nanocrystals by boron-doping

机译：硼掺杂增强硅纳米晶体超快非线性光学响应

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摘要

Nonlinear optical responses of boron (B)-doped silicon nanocrystals (Si-ncs) embedded in borosilicate glass were studied by z-scan and optical Kerr gate methods under femtosecond excitation at 780 nm. The nonlinear refractive index (n_(2)) and the two photon absorption coefficients (beta) of B-doped Si-ncs were found to be 3 times enhanced, compared to those of intrinsic Si-ncs. The response time was faster than 100 fs even at 5 K. The origin of the large nonlinear optical response was discussed, based on the experimental data of n_(2), electron spin resonance spectra, and linear absorption spectra.
机译：通过飞秒激发在780 nm的z扫描和光学Kerr门方法研究了嵌入硼硅酸盐玻璃中的掺杂硼（B）的硅纳米晶体（Si-ncs）的非线性光学响应。发现B掺杂的Si-ncs的非线性折射率（n_（2））和两个光子吸收系数（β）比本征Si-ncs的非线性折射率提高了3倍。即使在5 K时，响应时间也比100 fs快。基于n_（2）的实验数据，电子自旋共振谱和线性吸收谱，讨论了大的非线性光学响应的​​起源。

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