Direct Observation of Infrared Plasmonic Fano Antiresonances by a Nanoscale Electron Probe

In this Letter, we exploit recent breakthroughs in monochromated aberration-corrected scanning transmission electron microscopy (STEM) to resolve infrared plasmonic Fano antiresonances in individual nanofabricated disk-rod dimers. Using a combination of electron energy-loss spectroscopy (EELS) and t...

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Bibliographic Details
Published in:arXiv.org 2019-09
Main Authors: Smith, Kevin C, Olafsson, Agust, Hu, Xuan, Quillin, Steven C, Idrobo, Juan Carlos, Collette, Robyn, Rack, Philip D, Camden, Jon P, Masiello, David J
Format: Article
Language:English
Subjects:
Dimers
Electron energy
Electron energy loss spectroscopy
Electron probes
Electrons
Scanning transmission electron microscopy
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Summary:In this Letter, we exploit recent breakthroughs in monochromated aberration-corrected scanning transmission electron microscopy (STEM) to resolve infrared plasmonic Fano antiresonances in individual nanofabricated disk-rod dimers. Using a combination of electron energy-loss spectroscopy (EELS) and theoretical modeling, we investigate and characterize a subspace of the weak coupling regime between quasi-discrete and quasi-continuum localized surface plasmon resonances where infrared plasmonic Fano antiresonances appear. This work illustrates the capability of STEM instrumentation to experimentally observe nanoscale plasmonic responses that were previously the domain only of higher resolution infrared spectroscopies.
ISSN:2331-8422
DOI:10.48550/arxiv.1908.01395