Surface plasmon assisted magnetic anomalies on room temperature gold films in high-intensity laser fields

TL;DR

This study investigates how high-intensity laser fields induce surface plasmon effects and magnetic anomalies in room temperature gold films, revealing new phenomena related to electron pairing and diamagnetism.

Contribution

It demonstrates the connection between surface plasmon oscillations, electron pairing, and magnetic anomalies in gold films under intense laser illumination.

Findings

Electron pairing occurs at around 80 GW/cm2 laser intensity.

Magnetic anomalies and diamagnetism appear in the same intensity region.

Surface plasmon oscillations influence electron emission spectra.

Abstract

Supplementing our STM and electron emission studies investigations, concluding in electron pairing in strong laser fields [1], further time-of-flight electron emission studies were carried out, changing the angle of polarization of the incident light, exciting surface plasmon oscillations. It has been found, that those parts of the electron spectrum which have been attributed to electron pairing have a significantly different angular dependence around 80 GW/cm2 where the pairing effect has been found than outside this region (e.g. 120 GW/cm2). These results have been interpreted as the appearance of ideal or partly ideal diamagnetism on the one hand and as anomaly in the magneto-optical effect (rotation) on the other, in the same laser intensity region where the pairing effect has been found.