期刊
ACS PHOTONICS
卷 3, 期 4, 页码 611-619出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00710
关键词
femtosecond electron source; adiabatic nanofocusing; surface plasmon polariton; nanotip; point-projection microscopy; ultrafast electron microscopy
类别
资金
- Max Planck Society
- National Science Foundation (NSF Grant) [CHE 1306398]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0008807]
- U.S. DOE [DEAC06-76RL01830]
Progress in ultrafast electron microscopy relies on the development of efficient laser-driven electron sources delivering femtosecond electron pulses to the sample. In particular, recent advances employ photoemission from metal nanotips as coherent point-like femtosecond low-energy electron sources. We report the nonlinear emission of ultrashort electron wave packets from a gold nanotip generated by nonlocal excitation and nanofocusing of surface plasmon polaritons. We verify the nanoscale localization of plasmon-induced electron emission by its electrostatic collimation characteristics. With a plasmon polariton pulse duration less than 8 fs at the apex, we identify multiphoton photoemission as the underlying emission process. The quantum efficiency of the plasmon-induced emission exceeds that of photoemission from direct demonstrate the application for plasmon-triggered point-projection imaging of an individual semiconductor nanowire at 3 mu m tip sample distance. On the basis of numerical simulations we estimate an electron pulse duration at the sample less than 10 fs for tip-sample distances up to a few micrometers. Plasmon-driven nanolocalized electron emission thus enables femtosecond point-projection microscopy with unprecedented temporal and spatial resolution, femtosecond low-energy electron in-line holography, and a new route toward femtosecond scanning tunneling microscopy and spectroscopy.
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