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- W3024508748 abstract "Free electrons act as a source of highly confined, spectrally broad optical fields that are widely used to map photonic modes with nanometer/millielectronvolt space/energy resolution through currently available electron energy-loss and cathodoluminescence spectroscopies. These techniques are understood as probes of the linear optical response, while nonlinear dynamics has escaped observation with similar degree of spatial detail, despite the strong enhancement of the electron evanescent field with decreasing electron energy. Here, we show that the field accompanying low-energy electrons can trigger anharmonic response in strongly nonlinear materials. Specifically, through realistic quantum-mechanical simulations, we find that the interaction between ≲100 eV electrons and plasmons in graphene nanostructures gives rise to substantial optical nonlinearities that are discernible as saturation and spectral shifts in the plasmonic features revealed in the cathodoluminescence emission and electron energy-loss spectra. Our results support the use of low-energy electron-beam spectroscopies for the exploration of nonlinear optical processes in nanostructures." @default.
- W3024508748 created "2020-05-21" @default.
- W3024508748 creator A5008692445 @default.
- W3024508748 creator A5061170371 @default.
- W3024508748 date "2020-05-13" @default.
- W3024508748 modified "2023-10-16" @default.
- W3024508748 title "Nonlinear Interactions between Free Electrons and Nanographenes" @default.
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- W3024508748 doi "https://doi.org/10.1021/acs.nanolett.0c00538" @default.
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