High spatial and energy resolution electron energy loss spectroscopy of the magnetic and electric excitations in plasmonic nanorod oligomers

Grace Pakeltis; Enzo Rotunno; Siamak Khorassani; David A. Garfinkel; Robyn Collette; Claire A. West; Scott T. Retterer; Juan Carlos Idrobo; David J. Masiello; Philip D. Rack

doi:10.1364/OE.416046

High spatial and energy resolution electron energy loss spectroscopy of the magnetic and electric excitations in plasmonic nanorod oligomers

Grace Pakeltis, Enzo Rotunno, Siamak Khorassani, David A. Garfinkel, Robyn Collette, Claire A. West, Scott T. Retterer, Juan Carlos Idrobo, David J. Masiello, Philip D. Rack

Center for Nanophase Matls Sciences

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

4 Scopus citations

Abstract

We leverage the high spatial and energy resolution of monochromated aberration-corrected scanning transmission electron microscopy to study the hybridization of cyclic assemblies of plasmonic gold nanorods. Detailed experiments and simulations elucidate the hybridization of the coupled long-axis dipole modes into collective magnetic and electric dipole plasmon resonances. We resolve the magnetic dipole mode in these closed loop oligomers with electron energy loss spectroscopy and confirm the mode assignment with its characteristic spectrum image. The energy splitting of the magnetic mode and antibonding modes increases with the number of polygon edges (n). For the n=3-6 oligomers studied, optical simulations using normal incidence and s-polarized oblique incidence show the respective electric and magnetic modes' extinction efficiencies are maximized in the n=4 arrangement.

Original language	English
Pages (from-to)	4661-4671
Number of pages	11
Journal	Optics Express
Volume	29
Issue number	3
DOIs	https://doi.org/10.1364/OE.416046
State	Published - 2021

Funding

Funding. H2020 Research and Innovation Programme under Grant Agreement No 766970 Q-SORT (H2020-FETOPEN-1-2016-2017); National Science Foundation (DMR-1708189, DMR-1709275); Center for Materials Processing at the University of Tennessee; Oak Ridge National Laboratory (Center for Nanophase Materials Science). Acknowledgements. The authors acknowledge that the plasmonic structures were synthesized, and the EELS measurements were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This research was conducted, in part, using instrumentation within ORNL’s Materials Characterization Core provided by UT-Batelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy, and sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy.

Funders	Funder number
Center for Nanophase Materials Science
H2020 Research and Innovation Programme	766970 Q-SORT, H2020-FETOPEN-1-2016-2017
National Science Foundation	DMR-1708189, 1709275, DMR-1709275
U.S. Department of Energy
Oak Ridge National Laboratory
University of Tennessee

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title = "High spatial and energy resolution electron energy loss spectroscopy of the magnetic and electric excitations in plasmonic nanorod oligomers",

abstract = "We leverage the high spatial and energy resolution of monochromated aberration-corrected scanning transmission electron microscopy to study the hybridization of cyclic assemblies of plasmonic gold nanorods. Detailed experiments and simulations elucidate the hybridization of the coupled long-axis dipole modes into collective magnetic and electric dipole plasmon resonances. We resolve the magnetic dipole mode in these closed loop oligomers with electron energy loss spectroscopy and confirm the mode assignment with its characteristic spectrum image. The energy splitting of the magnetic mode and antibonding modes increases with the number of polygon edges (n). For the n=3-6 oligomers studied, optical simulations using normal incidence and s-polarized oblique incidence show the respective electric and magnetic modes' extinction efficiencies are maximized in the n=4 arrangement.",

author = "Grace Pakeltis and Enzo Rotunno and Siamak Khorassani and Garfinkel, {David A.} and Robyn Collette and West, {Claire A.} and Retterer, {Scott T.} and Idrobo, {Juan Carlos} and Masiello, {David J.} and Rack, {Philip D.}",

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year = "2021",

doi = "10.1364/OE.416046",

language = "English",

volume = "29",

pages = "4661--4671",

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T1 - High spatial and energy resolution electron energy loss spectroscopy of the magnetic and electric excitations in plasmonic nanorod oligomers

AU - Pakeltis, Grace

AU - Rotunno, Enzo

AU - Khorassani, Siamak

AU - Garfinkel, David A.

AU - Collette, Robyn

AU - West, Claire A.

AU - Retterer, Scott T.

AU - Idrobo, Juan Carlos

AU - Masiello, David J.

AU - Rack, Philip D.

PY - 2021

Y1 - 2021

N2 - We leverage the high spatial and energy resolution of monochromated aberration-corrected scanning transmission electron microscopy to study the hybridization of cyclic assemblies of plasmonic gold nanorods. Detailed experiments and simulations elucidate the hybridization of the coupled long-axis dipole modes into collective magnetic and electric dipole plasmon resonances. We resolve the magnetic dipole mode in these closed loop oligomers with electron energy loss spectroscopy and confirm the mode assignment with its characteristic spectrum image. The energy splitting of the magnetic mode and antibonding modes increases with the number of polygon edges (n). For the n=3-6 oligomers studied, optical simulations using normal incidence and s-polarized oblique incidence show the respective electric and magnetic modes' extinction efficiencies are maximized in the n=4 arrangement.

AB - We leverage the high spatial and energy resolution of monochromated aberration-corrected scanning transmission electron microscopy to study the hybridization of cyclic assemblies of plasmonic gold nanorods. Detailed experiments and simulations elucidate the hybridization of the coupled long-axis dipole modes into collective magnetic and electric dipole plasmon resonances. We resolve the magnetic dipole mode in these closed loop oligomers with electron energy loss spectroscopy and confirm the mode assignment with its characteristic spectrum image. The energy splitting of the magnetic mode and antibonding modes increases with the number of polygon edges (n). For the n=3-6 oligomers studied, optical simulations using normal incidence and s-polarized oblique incidence show the respective electric and magnetic modes' extinction efficiencies are maximized in the n=4 arrangement.

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JO - Optics Express

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High spatial and energy resolution electron energy loss spectroscopy of the magnetic and electric excitations in plasmonic nanorod oligomers

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