论文标题
光纤维纳米托管发射的光菲尔德电子发射
Photofield electron emission from an optical fiber nanotip
论文作者
论文摘要
我们演示了基于分级指数多模二氧化硅光纤的纳米型电子源，一端逐渐缩小到曲率r〜50 nm的半径，并用薄膜涂有金色的金膜。我们报告了在暗场发射（Fe）发作以下的尖端偏置电位上对激光诱导的电子光发射的观察。单光子光场发射（PFE）被识别为发射机制，该发射机制表现出快速切换时间，上限为1μs。经过探索的光纤纳米动物是柔性的后刷发射器，可以使用具有光子能量的激光器在可见范围或更高范围内以连续波（CW）和脉冲模式进行操作。源的机械灵活性可以促进外部控制的定位。多个可寻址的纳米托管可以组装成诸如计算电子幽灵成像等应用的捆绑包中。
We demonstrate a nanotip electron source based on a graded index multimode silica optical fiber, tapered at one end to a radius of curvature r ~ 50 nm and coated with a thin film of gold. We report observation of laser-induced electron photoemission at tip bias potentials below the onset of dark field emission (FE). Single-photon photofield emission (PFE) is identified as the emission mechanism, which exhibits fast switching times with an upper limit on the order of 1 μs. The explored fiber optic nanotips are flexible back-illuminated emitters, which can be operated in continuous wave (CW) and pulsed modes using lasers with photon energies in the visible range or higher. The mechanical flexibility of the source can facilitate externally controlled positioning. Multiple, individually addressable, nanotips may be assembled into a bundle for applications such as computational electron ghost imaging.
