Visualization of Plasmonic Couplings Using Ultrafast Electron Microscopy

Haihua Liu; Thomas E. Gage; Prem Singh; Amit Jaiswal; Richard D. Schaller; Jau Tang; Sang Tae Park; Stephen K. Gray; Ilke Arslan

doi:10.1021/acs.nanolett.1c01824

Visualization of Plasmonic Couplings Using Ultrafast Electron Microscopy

Haihua Liu^*, Thomas E. Gage, Prem Singh, Amit Jaiswal, Richard D. Schaller, Jau Tang, Sang Tae Park, Stephen K. Gray, Ilke Arslan

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, and quantum information. An understanding of the coupling mechanism in these hybrid systems is of vital importance to its applications. Previous efforts in this field mainly focused on spectroscopic studies of strong coupling within the hybrids with no spatial resolution. Here we report direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale by photon-induced near-field electron microscopy in an ultrafast electron microscope for the first time. The proximity of a step in the graphene to the nanocapsule causes asymmetric surface charge density at the ends of the nanocapsules. Computational electromagnetic simulations confirm the experimental observations. The results reported here indicate that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale, enabling promising future plasmonic devices.

Original language	English (US)
Pages (from-to)	5842-5849
Number of pages	8
Journal	Nano letters
Volume	21
Issue number	13
DOIs	https://doi.org/10.1021/acs.nanolett.1c01824
State	Published - Jul 14 2021

Funding

This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357 and, in part, supported from the Department of Biotechnology (DBT), Government of India, under project number BT/PR14749/NNT/28/954/2015. A.J. would like to acknowledge Advanced Materials Research Centre and BioX Centre, IIT Mandi, for providing the research and infrastructure facility.

Keywords

Plasmonic coupling
discrete dipole approximation
gold nanocapsule
graphene
hybriding
photon-induced near-field electron microscopy
ultrafast electron microscopy

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Access to Document

10.1021/acs.nanolett.1c01824

Cite this

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title = "Visualization of Plasmonic Couplings Using Ultrafast Electron Microscopy",

abstract = "Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, and quantum information. An understanding of the coupling mechanism in these hybrid systems is of vital importance to its applications. Previous efforts in this field mainly focused on spectroscopic studies of strong coupling within the hybrids with no spatial resolution. Here we report direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale by photon-induced near-field electron microscopy in an ultrafast electron microscope for the first time. The proximity of a step in the graphene to the nanocapsule causes asymmetric surface charge density at the ends of the nanocapsules. Computational electromagnetic simulations confirm the experimental observations. The results reported here indicate that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale, enabling promising future plasmonic devices.",

keywords = "Plasmonic coupling, discrete dipole approximation, gold nanocapsule, graphene, hybriding, photon-induced near-field electron microscopy, ultrafast electron microscopy",

author = "Haihua Liu and Gage, {Thomas E.} and Prem Singh and Amit Jaiswal and Schaller, {Richard D.} and Jau Tang and Park, {Sang Tae} and Gray, {Stephen K.} and Ilke Arslan",

note = "Funding Information: This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357 and, in part, supported from the Department of Biotechnology (DBT), Government of India, under project number BT/PR14749/NNT/28/954/2015. A.J. would like to acknowledge Advanced Materials Research Centre and BioX Centre, IIT Mandi, for providing the research and infrastructure facility. Publisher Copyright: {\textcopyright} 2021 UChicago Argonne, LLC, Operator of Argonne National Laboratory. Published by American Chemical Society",

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AU - Liu, Haihua

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AU - Schaller, Richard D.

AU - Tang, Jau

AU - Park, Sang Tae

AU - Gray, Stephen K.

AU - Arslan, Ilke

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PY - 2021/7/14

Y1 - 2021/7/14

N2 - Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, and quantum information. An understanding of the coupling mechanism in these hybrid systems is of vital importance to its applications. Previous efforts in this field mainly focused on spectroscopic studies of strong coupling within the hybrids with no spatial resolution. Here we report direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale by photon-induced near-field electron microscopy in an ultrafast electron microscope for the first time. The proximity of a step in the graphene to the nanocapsule causes asymmetric surface charge density at the ends of the nanocapsules. Computational electromagnetic simulations confirm the experimental observations. The results reported here indicate that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale, enabling promising future plasmonic devices.

AB - Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, and quantum information. An understanding of the coupling mechanism in these hybrid systems is of vital importance to its applications. Previous efforts in this field mainly focused on spectroscopic studies of strong coupling within the hybrids with no spatial resolution. Here we report direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale by photon-induced near-field electron microscopy in an ultrafast electron microscope for the first time. The proximity of a step in the graphene to the nanocapsule causes asymmetric surface charge density at the ends of the nanocapsules. Computational electromagnetic simulations confirm the experimental observations. The results reported here indicate that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale, enabling promising future plasmonic devices.

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Visualization of Plasmonic Couplings Using Ultrafast Electron Microscopy

Abstract

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Keywords

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