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Nonlinear inelastic electron scattering revealed by plasmon-enhanced electron energy-loss spectroscopy
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2014 (English)In: Nature Physics, ISSN 1745-2473, E-ISSN 1745-2481, Vol. 10, no 10, 753-757 p.Article in journal (Refereed) Published
Abstract [en]

Electron energy-loss spectroscopy is a powerful tool for identifying the chemical composition of materials(1-5). It relies mostly on the measurement of inelastic electrons, which carry specific atomic or molecular information. Inelastic electron scattering, however, has a very low intensity, often orders of magnitude weaker than that of elastically scattered electrons. Here, we report the observation of enhanced inelastic electron scattering from silver nanostructures, the intensity of which can reach up to 60% of its elastic counterpart. A home-made scanning probe electron energy-loss spectrometer(6) was used to produce highly localized plasmonic excitations, significantly enhancing the strength of the local electric field of silver nanostructures. The intensity of inelastic electron scattering was found to increase nonlinearly with respect to the electric field generated by the tip-sample bias, providing direct evidence of nonlinear electron scattering processes.

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2014. Vol. 10, no 10, 753-757 p.
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URN: urn:nbn:se:kth:diva-155795DOI: 10.1038/NPHYS3051ISI: 000343225200019OAI: diva2:763739

QC 20141117

Available from: 2014-11-17 Created: 2014-11-13 Last updated: 2014-11-17Bibliographically approved

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Luo, Yi
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