単一電子をパルス利用した電子線励起による時間分解光計測

Abstract

Cathodoluminescence, the light emission induced by electron beam, has been increasingly used in combination with electron microscopy for the analysis of semiconductors and the visualization of electromagnetic fields at the nanoscale for plasmonics or nanophotonics, surpassing the diffraction limit. This article introduces a time-resolved cathodoluminescence method that does not require pulsing the electron beam but utilizes individual electrons as excitation pulses within the naturally emitted electron beam for time-resolved measurements. The discussion focuses on two techniques: one using photon-photon correlations and the other based on electron-photon correlations. These approaches provide insights into the behavior of light at extremely small scales, offering valuable tools for advancing the understanding nanoscale optical phenomena as well as for quantum measurement.journal articl