金属尖的强场阈上光电发射
Strong-field above-threshold photoemission from sharp metal tips
摘要：
我们提出了能量分辨测量电子发射从尖锐的金属尖驱动的低能量脉冲从几个周期的激光振荡器。我们观察到阈值以上的光电子发射的光子顺序高达9。当激光强度为2*10^11 W/cm ^2时，最低阶峰受到抑制，表明强场效应开始出现。我们还观察到峰位移与强度呈线性关系，斜率约为-1.8eV /（10^12 W/cm^2）。我们属性的激光场效应的大小发生在尖端的表面的场增强。
英文摘要：
We present energy-resolved measurements of electron emission from sharp metal tips driven with low energy pulses from a few-cycle laser oscillator. We observe above-threshold photoemission with a photon order of up to 9. At a laser intensity of 2*10^11 W/cm^2 suppression of the lowest order peak occurs, indicating the onset of strong-field effects. We also observe peak shifting linearly with intensity with a slope of around -1.8eV / (10^12 W/cm^2). We attribute the magnitude of the laser field effects to field enhancement taking place at the tip's surface.
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