Cathodoluminescence, light injection and EELS in STEM: From comparative to coincidence experiments

TL;DR

This review discusses advanced electron spectroscopy techniques in STEM, emphasizing coincidence experiments that combine different spectroscopies to access unique nano-optics information at high temporal resolutions.

Contribution

It introduces the concept of temporal coincidence experiments in electron microscopy and discusses their instrumental requirements and potential applications in nano-optics.

Findings

Coincidence experiments reveal new information inaccessible to independent spectroscopies.

Instrumental modifications enable high temporal resolution in electron spectroscopy.

Potential for enhanced nano-optics applications in STEM.

Abstract

Electron spectroscopy implemented in electron microscopes provides high spatial resolution, down to the atomic scale, of the chemical, electronic, vibrational and optical properties of materials. In this review, we will describe how temporal coincidence experiments in the nanosecond to femtosecond range between different electron spectroscopies involving photons, inelastic electrons and secondary electrons can provide information bits not accessible to independent spectroscopies. In particular, we will focus on nano-optics applications. The instrumental modifications necessary for these experiments are discussed, as well as the perspectives for these coincidence techniques.