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Interrogating Quantum Nonlocal Effects in Nanoplasmonics through Electron-Beam Spectroscopy.

P A D Gonçalves1, F Javier García de Abajo1,2

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Quantum nonlocal effects significantly impact metal nanostructure optical responses. This study presents a method using electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) to retrieve quantum surface response, crucial for nanoplasmonics.

Keywords:
EELScathodoluminescenceelectron-beam spectroscopynanophotonicsplasmonsquantum nonlocal effectsquantum plasmonics

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Area of Science:

  • Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Understanding quantum nonlocal effects is crucial for metal nanostructures and nanoscale plasmonic devices.
  • The optical response of metals at the nanoscale is strongly influenced by quantum phenomena.

Purpose of the Study:

  • To present a scheme for retrieving the quantum surface response of metals, described by Feibelman d-parameters.
  • To demonstrate the impact of quantum nonlocal effects on electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) spectra.

Main Methods:

  • Utilizing electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements.
  • Theoretically demonstrating the influence of quantum nonlocal effects on spectral shifts and damping.

Main Results:

  • Quantum nonlocal effects dramatically alter EELS and CL spectra at the nanometer scale.
  • Free electrons probe metal optical responses at quantum-mechanical length scales via subwavelength near-fields.

Conclusions:

  • The developed scheme facilitates the retrieval of quantum surface response using EELS and CL.
  • This work enables practical inclusion of nonclassical effects in nanoplasmonics through the d-parameter formalism.