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Electron Energy Loss Spectroscopy of Surface Plasmon Resonances on Aberrant Gold Nanostructures
journal contribution
posted on 2016-10-03, 00:00 authored by Gregory
T. Forcherio, Drew DeJarnette, Mourad Benamara, D. Keith RoperEffects
of structural elongation, annulation, and irregularity
on emergent plasmonic modes were examined computationally and experimentally
using low-loss electron energy loss spectroscopy (EELS). Resonant
eigenstates were compared for multiple gold nanodisc shapes: circular,
elongated, annulated, and acircular annulated. Losses of resonant
eigenstates were mapped to distinguish discrete bright and dark resonance
modes that emerged from morphological changes. Single bright and dark
resonances exhibited by circular nanodiscs were supplemented by additional
bright modes arising from axial asymmetry induced by radial aberrations
in elongated discs. An antibonding bright mode appeared in annulated
discs due to different dipole patterns arising from charge interactions
on adjacent surfaces. Eccentricity on annulated discs hybridized resonant
mode structures from discs, rings, and ellipses. Direct comparison
between experimental measures and theory for a fabricated elongated
nanoring with morphological distortions showed in vacuo discrete modes collapse into singular, red-shifted resonances with
expanded bandwidths due to screening and interfacial damping with
dielectric substrate and metallic adhesion interlayer. These results
indicate effects of morphological aberrations and irregularities on
the plasmon activity of deposited, self-assembled, and/or oxidized
noble metal discs that may appear in natural environments.
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Keywords
metal discsEELSannulated discsresonance modesDirect comparisonResonant eigenstatesgold nanodisc shapeselectron Energy Loss Spectroscopyred-shifted resonancesmode structuresacircular annulatedmodes collapsecharge interactionsplasmon activitydielectric substrateSurface Plasmon ResonancesAberrant Gold Nanostructures Effectsplasmonic modesannulated discs hybridizedadhesion interlayerelectron energy loss spectroscopy
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