Quantifying quantum nonlocal effects in nanoplasmonics using electron-beam spectroscopies

Paulo André D. Gonçalves; F. Javier García de Abajo Sr.

doi:10.1117/12.2633608

3 October 2022 Quantifying quantum nonlocal effects in nanoplasmonics using electron-beam spectroscopies

Paulo André D. Gonçalves, F. Javier García de Abajo Sr.

Proceedings Volume PC12197, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX; PC121970S (2022) https://doi.org/10.1117/12.2633608
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

We present a concrete proposal for such response directly from experimental measurements of electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL). Our scheme exploits the ability of free-electron beams to produce deeply subwavelength near-fields and thus probe the optical response of metals at the nanoscale (i.e., where quantum effects can become important). Chiefly, we demonstrate how our theory can be employed towards a quantitative measurement of the quantum nonlocal response of metals [specifically, the surface-response functions d⊥(ω) and d∥(ω)] from the nonclassical features imprinted in the EELS and CL spectra. Notably, the quantitative knowledge of material’s quantum surface-response of metals is ought to be crucial for designing nanodevices with few-nm footprint and to engineer maximal light–matter interactions at the nanoscale.

Conference Presentation

Citation Download Citation

Paulo André D. Gonçalves and F. Javier García de Abajo Sr. "Quantifying quantum nonlocal effects in nanoplasmonics using electron-beam spectroscopies", Proc. SPIE PC12197, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX, PC121970S (3 October 2022); https://doi.org/10.1117/12.2633608

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