Spontaneous emission of radiation by metallic electrons in the presence of electromagnetic fields of surface plasmon oscillations

TL;DR

This paper provides an analytical study of how metallic electrons emit radiation when influenced by intense surface plasmon fields, revealing significant deviations from perturbative models and aligning well with experimental data.

Contribution

It introduces an exact dressed quantum state approach to model electron emission in strong plasmon fields, capturing non-perturbative effects.

Findings

Deviations from perturbative predictions at moderate laser intensities

Good qualitative agreement with experimental results

Identification of intensity-dependent emission behavior

Abstract

The spontaneous emission of radiation of metallic electrons embedded in a high-intensity enhanced surface plasmon field is considered analytically. The electrons are described by exact dressed quantum states which contain the interaction with the plasmon field non-perturbatively. Considerable deviations from the pertubative behaviour have been found in the intensity dependence of the emitted fundamental and the second harmonic signals, even at moderate incoming laser intensities. The theoretical predictions deduced from the formalism are in good qualitative agreement with the experimental results.