飞秒Laser脉冲对场发射位置的光控制
Optical Control of Field-Emission Sites by Femtosecond Laser Pulses
摘要：
我们研究了飞秒激光脉冲诱导的干净钨针尖的场发射模式。观察到场发射强度分布的强烈非对称调制依赖于光的偏振和激光入射方向相对于尖端顶点的方位角取向。实际上，我们已经实现了一个超快脉冲场发射源的网站选择性的10纳米尺度。局部领域的尖端和电子发射图案的基础上光激发的非平衡电子分布的模拟解释我们的观察定量。
英文摘要：
We have investigated field emission patterns from a clean tungsten tip apex induced by femtosecond laser pulses. Strongly asymmetric modulations of the field emission intensity distributions are observed depending on the polarization of the light and the laser incidence direction relative to the azimuthal orientation of tip apex. In effect, we have realized an ultrafast pulsed field-emission source with site selectivity on the 10 nm scale. Simulations of local fields on the tip apex and of electron emission patterns based on photo-excited nonequilibrium electron distributions explain our observations quantitatively.
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