In this article, we present coherent control of above-threshold photoemission from a tungsten nanotip achieving nearly perfect modulation. Depending on the pulse delay between fundamental () and second harmonic () pulses of a femtosecond fiber laser at the nanotip, electron emission is significantly enhanced or depressed during temporal overlap. Electron emission is studied as a function of pulse delay, optical near-field intensities, DC bias field and final photoelectron energy. Under optimized conditions modulation amplitudes of the electron emission of 97.5% are achieved. Experimental observations are discussed in the framework of quantum-pathway interference supported by local density of states simulations.

中文翻译：

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相干控制方案中钨纳米尖端的双色阈值以上光电发射的高可见度

在本文中，我们介绍了钨纳米尖端的阈值以上光电发射的相干控制，实现了近乎完美的调制。根据飞秒光纤激光器在纳米尖端的基波 () 和二次谐波 () 脉冲之间的脉冲延迟，电子发射在时间重叠期间显着增强或抑制。电子发射被研究为脉冲延迟、光学近场强度、直流偏置场和最终光电子能量的函数。在优化条件下，实现了 97.5% 的电子发射调制幅度。在由局部状态密度模拟支持的量子路径干扰框架中讨论了实验观察。