论文标题
表面等离子体从金属纤维纳米纤维增强的快速电子发射
Surface plasmon enhanced fast electron emission from metallised fibre optic nanotips
论文作者
论文摘要
纤维纳米托管的电子发射的物理机制，即隧道，多光子和热发射发射，可以防止快速开关或需要强烈的激光场。纳米级来源的时间分辨电子发射发现，从材料表征到量子相干性的基本研究的应用。我们提出了能够快速开关（<1 ns）的纳米尺寸电子源，可以用低功率飞秒激光器驱动。可以解释低激光功率发射的物理机制是表面等离子体增强的阈值光发射。观察到电子发射峰并为谐振等离激元激发提供支持。电子源是一种金属涂层的光纤，逐渐变成纳米大小的尖端。纤维是柔韧性的，背面照明促进了易于定位。该源用每激光脉冲的NJ几个NJ运行，使其成为一种多功能发射极，可实现纳米测量学，多源电子光刻和扫描探针显微镜。 关键字：光纤纳米托管，表面等离子体共振，多光子发射，阈值以上排放
Physical mechanisms of electron emission from fibre optic nanotips, namely, tunnelling, multi-photon, and thermionic emission, either prevent fast switching or require intense laser fields. Time-resolved electron emission from nano-sized sources finds applications ranging from material characterisation to fundamental studies of quantum coherence. We present a nano-sized electron source capable of fast-switching (<1 ns) that can be driven with low-power femtosecond lasers. The physical mechanism that can explain emission at low laser power is surface plasmon enhanced above-threshold photoemission. An electron emission peak is observed and provides support for resonant plasmonic excitation. The electron source is a metal-coated optical fibre tapered into a nano-sized tip. The fibre is flexible and back illuminated facilitating ease of positioning. The source operates with a few nJ per laser pulse, making this a versatile emitter that enables nanometrology, multisource electron-lithography and scanning probe microscopy. Keywords: fibre optic nanotip, surface plasmon resonance, multi-photon emission, above-threshold emission
