Characterizing localized surface plasmons using electron energy-loss spectroscopy

Abstract

Electron energy-loss spectroscopy (EELS) offers a window to view nanoscale properties and processes. When performed in a scanning transmission electron microscope, EELS can simultaneously render images of nanoscale objects with sub-nanometer spatial resolution and correlate them with spectroscopic information of $\sim 10-100$ meV spectral resolution. Consequently, EELS is a near-perfect tool for understanding the optical and electronic properties of individual and few-particle plasmonic metal nanoparticles assemblies, which are significant in a wide range of fields. This review presents an overview of basic plasmonics and EELS theory and highlights several recent noteworthy experiments involving the electron-beam interrogation of plasmonic metal nanoparticle systems.

arXiv commentWhen citing this paper, please use the following: Cherqui C, Thakkar N, Li G, Camden JP, Masiello DJ. 2015. Characterizing localized surface plasmons using electron energy-loss spectroscopy. Annu. Rev. Phys. Chem. 67: Submitted. Doi: 10.1146/annurev-physchem-040214-121612

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• Simultaneous nanoscale excitation and emission mapping by cathodoluminescence
• Selective probing of longitudinal and transverse plasmon modes with electron phase-matching
• Simulating electron energy-loss spectroscopy and cathodoluminescence for particles in arbitrary host medium using the discrete dipole approximation
• Exploring the spatial features of electronic transitions in molecular and biomolecular systems by swift electrons
• Spatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennas
• Complementarity and entanglement in a simple model of inelastic scattering