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  Nanofocused Plasmon-Driven Sub-10 fs Electron Point Source

Müller, M., Kravtsov, V., Paarmann, A., Raschke, M. B., & Ernstorfer, R. (2016). Nanofocused Plasmon-Driven Sub-10 fs Electron Point Source. ACS Photonics, 3(4), 611-619. doi:10.1021/acsphotonics.5b00710.

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1512.07037.pdf (Preprint), 2MB
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arXiv:1512.07037v2 [cond-mat.mes-hall] 3 Mar 2016
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 Creators:
Müller, Melanie1, Author           
Kravtsov, Vasily 2, Author
Paarmann, Alexander1, Author           
Raschke, Markus B.2, Author
Ernstorfer, Ralph1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Colorado 80309, United States, ou_persistent22              

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 Abstract: 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 apex illumination. We demonstrate the application for plasmon-triggered point-projection imaging of an individual semiconductor nanowire at 3 μm 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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Language(s): eng - English
 Dates: 2015-12-112016-04-20
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsphotonics.5b00710
 Degree: -

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Title: ACS Photonics
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 9 Volume / Issue: 3 (4) Sequence Number: - Start / End Page: 611 - 619 Identifier: Other: 2330-4022
CoNE: https://pure.mpg.de/cone/journals/resource/2330-4022