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Enhanced generation and anisotropic Coulomb scattering of hot electrons in an ultra-broadband plasmonic nanopatch metasurface.

Publication ,  Journal Article
Sykes, ME; Stewart, JW; Akselrod, GM; Kong, X-T; Wang, Z; Gosztola, DJ; Martinson, ABF; Rosenmann, D; Mikkelsen, MH; Govorov, AO; Wiederrecht, GP
Published in: Nature communications
October 2017

The creation of energetic electrons through plasmon excitation of nanostructures before thermalization has been proposed for a wide number of applications in optical energy conversion and ultrafast nanophotonics. However, the use of "nonthermal" electrons is primarily limited by both a low generation efficiency and their ultrafast decay. We report experimental and theoretical results on the use of broadband plasmonic nanopatch metasurfaces comprising a gold substrate coupled to silver nanocubes that produce large concentrations of hot electrons, which we measure using transient absorption spectroscopy. We find evidence for three subpopulations of nonthermal carriers, which we propose arise from anisotropic electron-electron scattering within sp-bands near the Fermi surface. The bimetallic character of the metasurface strongly impacts the physics, with dissipation occurring primarily in the gold, whereas the quantum process of hot electron generation takes place in both components. Our calculations show that the choice of geometry and materials is crucial for producing strong ultrafast nonthermal electron components.The creation of energetic electrons through plasmon excitation has implications in optical energy conversion and ultrafast nanophotonics. Here, the authors find evidence for three subpopulations of nonthermal carriers which arise from anisotropic electron-electron scattering near the Fermi surface.

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Published In

Nature communications

DOI

EISSN

2041-1723

ISSN

2041-1723

Publication Date

October 2017

Volume

8

Issue

1

Start / End Page

986
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Sykes, M. E., Stewart, J. W., Akselrod, G. M., Kong, X.-T., Wang, Z., Gosztola, D. J., … Wiederrecht, G. P. (2017). Enhanced generation and anisotropic Coulomb scattering of hot electrons in an ultra-broadband plasmonic nanopatch metasurface. Nature Communications, 8(1), 986. https://doi.org/10.1038/s41467-017-01069-3
Sykes, Matthew E., Jon W. Stewart, Gleb M. Akselrod, Xiang-Tian Kong, Zhiming Wang, David J. Gosztola, Alex B. F. Martinson, et al. “Enhanced generation and anisotropic Coulomb scattering of hot electrons in an ultra-broadband plasmonic nanopatch metasurface.Nature Communications 8, no. 1 (October 2017): 986. https://doi.org/10.1038/s41467-017-01069-3.
Sykes ME, Stewart JW, Akselrod GM, Kong X-T, Wang Z, Gosztola DJ, et al. Enhanced generation and anisotropic Coulomb scattering of hot electrons in an ultra-broadband plasmonic nanopatch metasurface. Nature communications. 2017 Oct;8(1):986.
Sykes, Matthew E., et al. “Enhanced generation and anisotropic Coulomb scattering of hot electrons in an ultra-broadband plasmonic nanopatch metasurface.Nature Communications, vol. 8, no. 1, Oct. 2017, p. 986. Epmc, doi:10.1038/s41467-017-01069-3.
Sykes ME, Stewart JW, Akselrod GM, Kong X-T, Wang Z, Gosztola DJ, Martinson ABF, Rosenmann D, Mikkelsen MH, Govorov AO, Wiederrecht GP. Enhanced generation and anisotropic Coulomb scattering of hot electrons in an ultra-broadband plasmonic nanopatch metasurface. Nature communications. 2017 Oct;8(1):986.

Published In

Nature communications

DOI

EISSN

2041-1723

ISSN

2041-1723

Publication Date

October 2017

Volume

8

Issue

1

Start / End Page

986