MTA "Lendület" Ultrafast Nanooptics Group, Wigner Research Centre for Physics , 1121 Budapest, Hungary.
ELI-ALPS Research Institute , ELI-HU Nonprofit Kft., 6720 Szeged, Hungary.
Nano Lett. 2017 Feb 8;17(2):1181-1186. doi: 10.1021/acs.nanolett.6b04893. Epub 2017 Jan 20.
Probing nanooptical near-fields is a major challenge in plasmonics. Here, we demonstrate an experimental method utilizing ultrafast photoemission from plasmonic nanostructures that is capable of probing the maximum nanoplasmonic field enhancement in any metallic surface environment. Directly measured field enhancement values for various samples are in good agreement with detailed finite-difference time-domain simulations. These results establish ultrafast plasmonic photoelectrons as versatile probes for nanoplasmonic near-fields.
探测纳米光学近场是等离子体光学的一个主要挑战。在这里，我们展示了一种利用等离子体纳米结构的超快光发射来探测任何金属表面环境中最大纳米等离子体场增强的实验方法。各种样品的直接测量的场增强值与详细的有限差分时间域模拟吻合良好。这些结果确立了超快等离子体光电子作为纳米等离子体近场的多功能探针。
