Dynamic configurational resonances caused by optical nonlinearities in ultra-fast near-field microscopy

Dynamic configurational resonances caused by optical nonlinearities in ultra-fast near-field microscopy
复制标题

超快近场显微镜中光学非线性引起的动态构型共振

DOI:
10.1088/2040-8978/15/3/035204
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发表时间:
2013
期刊:
影响因子:
2.1
通讯作者:
G. J. Salamo
G. J. Salamo
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
V. Lozovski;V. Vasilenko;G. G. Tarasov;C. Lienau;Y. I. Mazur;G. J. Salamo

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在强聚焦激光脉冲产生非平衡激子分布的情况下,利用绿色函数方法研究了光学非线性对半导体表面近场图像形成的影响。结果表明,如果激子系统处于共振状态,三阶非线性极化率的引入将显著改变系统的近场图像。我们的计算预测的动态组态共振所产生的峰值在一个101 ps的时间尺度上的近场图像的强度在远场泵浦近场探测实验。对于所有其他情况下,它示出的近场图像的形成中的非线性的作用是微不足道的。这些结果预期进一步深入了解激子动力学下的非相干非平衡载流子分布,并提供更好的理解超快近场实验。
The effect of optical nonlinearities on the formation of the near-field images over a semiconductor surface is studied by Green's function methods in the case of a nonequilibrium exciton distribution generated by a strongly focused laser pulse. It is shown that inclusion of the third-order nonlinear susceptibility in the system dramatically changes the near-field images if the excitonic system is in resonance. Our calculations predict the dynamic configurational resonances arising as peaks on a∼ 1 ps timescale in the intensity of the near-field image in the far-field pump–near-field probe experiments. For all other cases it is shown that the role of nonlinearity in the formation of the near-field images is insignificant. These results anticipate a further deep insight into exciton dynamics under incoherent nonequilibrium carrier distributions and provide better understanding of ultra-fast near-field experiments.
DOI: --
发表时间: 2001
影响因子: 2
作者:
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