The localized photoemission electron originating from the plasmonic “hot spots” in a metallic bowtie nanostructure can be separately switched on and off by adjusting the relative time delay between two orthogonally polarized laser pulses. The demonstrated femtosecond timing, nanometric spatial switching of multiphoton photoemission results from the interference of quantum pathways. Energy resolved measurement of the photoemission electrons further shows that the quantum pathway interference mechanism applies to control all the liberated electrons. The experimental results also show that the probability of electron emission through the quantum pathways from a plasmonic hot spot is determined by the localized emission response to the two incident laser pulses. These findings are of importance for controlling photoemission in ultrahigh spatiotemporal resolution in metallic plasmonic nanostructures.

中文翻译：

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通过量子途径对金属纳米结构的干扰，超快地切换光发射电子

通过调整两个正交偏振激光脉冲之间的相对时间延迟，可以分别打开和关闭源自金属领结纳米结构中等离激元“热点”的局部光电发射电子。飞秒计时，多光子光发射的纳米级空间转换是由量子途径的干扰引起的。对光发射电子的能量分辨测量进一步表明，量子途径干涉机制适用于控制所有释放的电子。实验结果还表明，通过等离子体路径从等离子体热点发出电子的概率取决于对两个入射激光脉冲的局部发射响应。