Ultrafast Electron Emission from a Sharp Metal Nanotaper Driven by Adiabatic Nanofocusing of Surface Plasmons

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• 作者：Jan Vogelsang ; J枚rg Robin ; Benedek J. Nagy ; P茅ter Dombi ; Daniel Rosenkranz ; Manuela Schiek ; Petra Gro脽 ; Christoph Lienau
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：15
• 期：7
• 页码：4685-4691
• 全文大小：381K
• ISSN：1530-6992

文摘

We report photoelectron emission from the apex of a sharp gold nanotaper illuminated via grating coupling at a distance of 50 渭m from the emission site with few-cycle near-infrared laser pulses. We find a fifty-fold increase in electron yield over that for direct apex illumination. Spatial localization of the electron emission to a nanometer-sized region is demonstrated by point-projection microscopic imaging of a silver nanowire. Our results reveal negligible plasmon-induced electron emission from the taper shaft and thus efficient nanofocusing of few-cycle plasmon wavepackets. This novel, remotely driven emission scheme offers a particularly compact source of ultrashort electron pulses of immediate interest for miniaturized electron microscopy and diffraction schemes with ultrahigh time resolution.