Carrier-envelope phase effects on the strong-field photoemission of electrons from metallic nanostructures
Carrier-envelope phase effects on the strong-field photoemission of electrons from metallic nanostructures
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DOI：
10.1038/nphoton.2013.288
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发表时间：
2014-01-01
期刊：
影响因子：
35
通讯作者：
Lienau, Christoph
中科院分区：
文献类型：
--
作者：
Piglosiewicz, Bjoern;Schmidt, Slawa;Lienau, Christoph
用少周期激光脉冲照射的锋利金属纳米锥正在成为高度受限的相干电子波包源，具有阿秒持续时间和强方向性(1-6)。利用光来引导、控制或切换此类电子波包 (7) 的可能性预计将为纳米等离子体场动力学 (8-10) 的直接可视化和固态纳米结构 (13,14) 中电子运动 (11,12) 的实时探测铺平道路。这种脉冲可以通过驱动激光场半周期内的强场诱导隧道效应和尖锐金锥体近场中的电子加速来产生(1,2,5)。在这里，我们展示了激光场的载流子包络相位对此类尖端强场发射电子的产生和运动的影响。我们观察到亚循环状态的高原状光电子能谱特征的宽度存在明显变化。这是朝着在超短长度和时间尺度上控制金属纳米结构内部和周围的相干电子运动迈出的一步。
Sharp metallic nanotapers irradiated with few-cycle laser pulses are emerging as a source of highly confined coherent electron wave packets with attosecond duration and strong directivity(1-6). The possibility to steer, control or switch such electron wave packets with light(7) is expected to pave the way towards direct visualization of nanoplasmonic field dynamics(8-10) and real-time probing of electron motion(11,12) in solid-state nanostructures(13,14). Such pulses can be generated by strong-field-induced tunnelling and acceleration of electrons in the near-field of sharp gold tapers within one half-cycle of the driving laser field(1,2,5). Here, we show the effect of the carrier-envelope phase of the laser field on the generation and motion of strong-field-emitted electrons from such tips. We observe clear variations in the width of plateau-like photoelectron spectra characteristic of the subcycle regime. This is a step towards controlling the coherent electron motion in and around metallic nanostructures over ultrashort lengths and timescales.