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

Journal Article · · Nature Communications
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. As a result, our calculations show that the choice of geometry and materials is crucial for producing strong ultrafast nonthermal electron components.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
Sponsoring Organization:
Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); Army Research Office; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1402469
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 8; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Determination of hot carrier energy distributions from inversion of ultrafast pump-probe reflectivity measurements journal May 2018
Quantifying the role of surface plasmon excitation and hot carrier transport in plasmonic devices journal August 2018
Tailorable Dynamics in Nonlinear Optical Metasurfaces journal June 2019
Photonic Metamaterial Absorbers: Morphology Engineering and Interdisciplinary Applications journal September 2019
Broadband Metamaterial Absorbers journal October 2018
Ultrafast pyroelectric photodetection with on-chip spectral filters journal November 2019
Generation of hot electrons in nanostructures incorporating conventional and unconventional plasmonic materials journal January 2019
Transient Second-Order Nonlinear Media: Breaking the Spatial Symmetry in the Time Domain via Hot-Electron Transfer journal January 2020

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