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  Spontaneous and stimulated electron–photon interactions in nanoscale plasmonic near fields

Liebtrau, M., Sivis, M., Feist, A., Lourenço-Martins, H., Pazos-Pérez, N., Alvarez-Puebla, R. A., et al. (2021). Spontaneous and stimulated electron–photon interactions in nanoscale plasmonic near fields. Light Science and Applications, 10: 82. doi:10.1038/s41377-021-00511-y.

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Liebtrau, M., Author
Sivis, M.1, Author           
Feist, A.1, Author           
Lourenço-Martins, H.1, Author           
Pazos-Pérez, N., Author
Alvarez-Puebla, R. A., Author
García de Abajo, F. J., Author
Polman, A., Author
Ropers, C.1, Author           
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1Department of Ultrafast Dynamics, MPI for Biophysical Chemistry, Max Planck Society, ou_3371855              

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Free keywords: Nanoparticles; Nanophotonics and plasmonics
 Abstract: The interplay between free electrons, light, and matter offers unique prospects for space, time, and energy resolved optical material characterization, structured light generation, and quantum information processing. Here, we study the nanoscale features of spontaneous and stimulated electron–photon interactions mediated by localized surface plasmon resonances at the tips of a gold nanostar using electron energy-loss spectroscopy (EELS), cathodoluminescence spectroscopy (CL), and photon-induced near-field electron microscopy (PINEM). Supported by numerical electromagnetic boundary-element method (BEM) calculations, we show that the different coupling mechanisms probed by EELS, CL, and PINEM feature the same spatial dependence on the electric field distribution of the tip modes. However, the electron–photon interaction strength is found to vary with the incident electron velocity, as determined by the spatial Fourier transform of the electric near-field component parallel to the electron trajectory. For the tightly confined plasmonic tip resonances, our calculations suggest an optimum coupling velocity at electron energies as low as a few keV. Our results are discussed in the context of more complex geometries supporting multiple modes with spatial and spectral overlap. We provide fundamental insights into spontaneous and stimulated electron-light-matter interactions with key implications for research on (quantum) coherent optical phenomena at the nanoscale.

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Language(s): eng - English
 Dates: 2021-04-15
 Publication Status: Published online
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41377-021-00511-y
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Title: Light Science and Applications
Source Genre: Journal
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Pages: 14 Volume / Issue: 10 Sequence Number: 82 Start / End Page: - Identifier: -