All-optical spatio-temporal control of electron emission from SiO2 nanospheres with femtosecond two-color laser fields
All-optical spatio-temporal control of electron emission from SiO2 nanospheres with femtosecond two-color laser fields
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DOI：
10.1088/1367-2630/ab26c1
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发表时间：
2019-07-01
影响因子：
3.3
通讯作者：
Kling, Matthias F.
中科院分区：
文献类型：
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作者：
Liu, Qingcao;Zherebtsov, Sergey;Kling, Matthias F.
场局部化的纳米结构照射激光脉冲的明确的波形，使时空剪裁的近场的子周期控制的电子动力学在纳米尺度。在这里，我们采用强烈的线偏振双色激光脉冲的最高能量的电子发射SiO2纳米粒子的全光控制。对于光传播效应变得重要的大小制度，我们证明了通过改变双色场的相对相位来控制相当一部分最快电子的优先发射角的可能性。基于轨迹的半经典模拟表明，对于所研究的纳米颗粒尺寸范围的方向转向可以归因于电子轨迹上的双色效应，而伴随的纳米颗粒表面上的电离率的空间分布的修改只有很小的影响。
Field localization by nanostructures illuminated with laser pulses of well-defined waveform enables spatio-temporal tailoring of the near-fields for sub-cycle control of electron dynamics at the nanoscale. Here, we apply intense linearly-polarized two-color laser pulses for all-optical control of the highest energy electron emission from SiO2 nanoparticles. For the size regime where light propagation effects become important, we demonstrate the possibility to control the preferential emission angle of a considerable fraction of the fastest electrons by varying the relative phase of the two-color field. Trajectory based semi-classical simulations show that for the investigated nanoparticle size range the directional steering can be attributed to the two-color effect on the electron trajectories, while the accompanied modification of the spatial distribution of the ionization rate on the nanoparticle surface has only a minor effect.