Two-Color Coherent Control of Femtosecond Above-Threshold Photoemission from a Tungsten Nanotip
Two-Color Coherent Control of Femtosecond Above-Threshold Photoemission from a Tungsten Nanotip
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DOI：
10.1103/physrevlett.117.217601
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发表时间：
2016-11-14
影响因子：
8.6
通讯作者：
Hommelhoff, Peter
中科院分区：
文献类型：
--
作者：
Foerster, Michael;Paschen, Timo;Hommelhoff, Peter
我们展示了相干控制的多光子和阈值以上的光发射从一个单一的固态纳米发射器驱动的基本和弱的二次谐波激光脉冲。取决于两个脉冲的相对相位，电子发射被调制，振荡电流信号的对比度高达94%。电子光谱表明，所有观察到的光子顺序同时和类似的影响。我们确认，光电子发射发生在10 fs。伴随的模拟表明，电流调制与其大的对比度的结果从两个干扰的量子路径导致电子发射。
We demonstrate coherent control of multiphoton and above-threshold photoemission from a single solid-state nanoemitter driven by a fundamental and a weak second harmonic laser pulse. Depending on the relative phase of the two pulses, electron emission is modulated with a contrast of the oscillating current signal of up to 94%. Electron spectra reveal that all observed photon orders are affected simultaneously and similarly. We confirm that photoemission takes place within 10 fs. Accompanying simulations indicate that the current modulation with its large contrast results from two interfering quantum pathways leading to electron emission.