Effect of multipole excitations in electron energy-loss spectroscopy of surface plasmon modes in silver nanowires

Zhou, Xiuli; Hörl, Anton; Trügler, Andreas; Hohenester, Ulrich; Norris, Theodore B.; Herzing, Andrew A.

doi:10.1063/1.4903535

Effect of multipole excitations in electron energy-loss spectroscopy of surface plasmon modes in silver nanowires

Journal Article · Sun Dec 07 23:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4903535· OSTI ID:1370076

^[1]; Hörl, Anton ^[2]; Trügler, Andreas ^[2]; Hohenester, Ulrich ^[2]; Norris, Theodore B. ^[1]; Herzing, Andrew A. ^[3]

Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science
Karl-Franzens-Univ. Graz, Graz (Austria). Inst. für Physk
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.

We have characterized the surface plasmon resonance (SPR) in silver nanowires using spatially resolved electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope. Non-symmetric EELS spectra due to high-k SPR propagation along the nanowire and spectral shifts due to higher-order mode excitation are observed when the beam is positioned near the tip of the nanowire. When the beam is far from the tip region and on the side of nanowire, no spectral shifts are observed as the beam is scanned in the radial direction of the nanowire. The experimental spectra are compared with three different theoretical approaches: direct numerical calculation of the energy loss, analytical models for energy loss, and numerical simulations using an optical model. All three models reproduce the spectral shifts as the electron beam approaches the cap of the nanowire. The analytical model reveals the origin of the shifts in high-order plasmon mode excitation.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0000957

OSTI ID:: 1370076

Alternate ID(s):: OSTI ID: 1226597
OSTI ID: 22402754

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 22 Vol. 116; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Multipole plasmons and their disappearance in few-nanometre silver nanoparticles Raza, Søren; Kadkhodazadeh, Shima; Christensen, Thomas Nature Communications, Vol. 6, Issue 1 https://doi.org/10.1038/ncomms9788	journal	November 2015
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Multipole plasmons and their disappearance in few-nanometer silver nanoparticles Raza, Søren; Kadkhodazadeh, Shima; Christensen, Thomas arXiv https://doi.org/10.48550/arxiv.1505.00594	text	January 2015

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