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Nanometric probing with a femtosecond, intra-cavity standing wave

Optical standing waves are intrinsically nanometric, spatially fixed interference-field patterns. At a commensurate scale, metallic nanotips serve as coherent, atomic-sized electron sources. Here, we explore the localized photofield emission from a tungsten nanotip with a transient standing wave. It...

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Bibliographic Details
Main Authors: Heldt, Tobias (Author) , Oelmann, Jan-Hendrik (Author) , Guth, Lennart (Author) , Lackmann, Nick (Author) , Matt, Lukas (Author) , Pfeifer, Thomas (Author) , Crespo López-Urrutia, José Ramon (Author)
Format: Article (Journal)
Language:English
Published: 28. November 2024
In: Nanophotonics
Year: 2024, Volume: 13, Issue: 25, Pages: 4639-4646
ISSN:2192-8614
DOI:10.1515/nanoph-2024-0332
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1515/nanoph-2024-0332
Verlag, kostenfrei, Volltext: https://www.degruyterbrill.com/document/doi/10.1515/nanoph-2024-0332/html
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Author Notes:Tobias Heldt, Jan-Hendrik Oelmann, Lennart Guth, Nick Lackmann, Lukas Matt, Thomas Pfeifer and José R. Crespo López-Urrutia
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Summary:Optical standing waves are intrinsically nanometric, spatially fixed interference-field patterns. At a commensurate scale, metallic nanotips serve as coherent, atomic-sized electron sources. Here, we explore the localized photofield emission from a tungsten nanotip with a transient standing wave. It is generated within an optical cavity with counter-propagating femtosecond pulses from a near-infrared, 100-MHz frequency comb. Shifting the phase of the standing wave at the tip reveals its nodes and anti-nodes through a strong periodic modulation of the emission current. We find the emission angles to be distinct from those of a traveling wave, and attribute this to the ensuing localization of emission from different crystallographic planes. Supported by a simulation, we find that the angle of maximum field enhancement is controlled by the phase of the standing wave. Intra-cavity nanotip interaction not only provides higher intensities than in free-space propagation, but also allows for structuring the light field even in the transverse direction by selection of high-order cavity modes.
Item Description:Gesehen am 02.06.2025
Physical Description:Online Resource
ISSN:2192-8614
DOI:10.1515/nanoph-2024-0332

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