Probing plasmonic excitation mechanisms and far-field radiation of single-crystalline gold tapers with electrons

Lingstädt, Robin; Talebi, Nahid; Guo, Surong; Sigle, Wilfried; Campos, Alfredo; Kociak, Mathieu; Esmann, Martin; Becker, Simon F.; Okunishi, Eiji; Mukai, Masakazu; Lienau, Christoph; Aken, Peter A. van

doi:10.1098/rsta.2019.0599

Cited by 3 publications

(3 citation statements)

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“…2e, see SI for details). Note that such interferences from sequential interactions or multipath scattering are characteristic of coherent cathodoluminescence [37,60,61].…”

Section: Spatial and Spectral Mapping Of Electron-induced Cavity Exci...mentioning

confidence: 99%

Cavity-mediated electron-photon pairs

Feist,

Huang,

Arend

et al. 2022

Preprint

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Advancing quantum information, communication and sensing relies on the generation and control of quantum correlations in complementary degrees of freedom. Here, we demonstrate the preparation of electron-photon pair states using the phase-matched interaction of free electrons with the evanescent vacuum field of a photonic-chip-based optical microresonator. Spontaneous inelastic scattering produces intracavity photons coincident with energy-shifted electrons. Harnessing these pairs for correlationenhanced imaging, we achieve a two-orders of magnitude contrast improvement in cavity-mode mapping by coincidence-gated electron spectroscopy. This parametric pair-state preparation will underpin the future development of freeelectron quantum optics, providing a pathway to quantum-enhanced imaging, electron-photon entanglement, and heralded single-electron and Fock-state photon sources.

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“…2e, see SI for details). Note that such interferences from sequential interactions or multipath scattering are characteristic of coherent cathodoluminescence [37,60,61].…”

Section: Spatial and Spectral Mapping Of Electron-induced Cavity Exci...mentioning

confidence: 99%

Cavity-mediated electron-photon pairs

Feist,

Huang,

Arend

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Unlike dipolar bright LSPR modes, dipolar dark modes, centrosymmetric multipolar LSPRs and VPs are not typically excited by far-field plane-wave optical excitation due to symmetry restrictions and the longitudinal nature of VPs respectively [45][46][47][48]. This usually limits optical studies of plasmons in metallic nanoparticles to studies of opticallyactive dipolar modes rather than higher-order modes or VPs.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale mapping of shifts in dark plasmon modes in sub 10 nm aluminum nanoantennas

2022

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In this work, we report the fabrication and spectroscopic characterization of aluminum nanocavities consisting of hexamer or tetramer clusters of Al nanorods having sub-10-nm widths. Here, volume plasmon (VP) and localized surface plasmon resonance (LSPR) modes in the nanocavities are revealed by low-loss electron energy-loss spectroscopy (EELS) in an aberration-corrected scanning transmission electron microscope (STEM). We map the VP energy and lifetime across Al nanorods and observe decreases in the VP energy and lifetime at grain boundaries and surface oxide interfaces. A reduction in VP energy and lifetime at grain boundaries is consistent with a reduction in free carrier density and increased plasmon scattering at these locations. Dipolar LSPR modes resonant in the UV and blue regions of the electromagnetic spectrum as well as higher energy optically-dark quadrupolar and hexapolar LSPR modes are also observed and mapped by STEM and EELS. All LSPR modes are confirmed via electromagnetic simulations based on the boundary element method. Both tetramer and hexamer structures support the excitation of dipolar bright and dipolar dark modes. Finally, we find that asymmetries in fabricated nanorod hexamer and tetramer nanocavities may result in a mode mixing leading to shifts in dipolar dark LSPR modes.

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“…Conical metallic tapers represent an intriguing sub-class of metallic nanostructures [6], as their plasmonic properties show characteristics in strong correlation with their geometrical properties. Favourable plasmonic resonances can be tailored by optimizing structural parameters like surface roughness or face opening angles.…”

mentioning

confidence: 99%