867. Wilhelm and Else Heraeus Seminar on "Quantum Electron-Photon Interactions"

Investigating the lasing properties of a nanolaser with an ultrafast transmission electron microscope

Not scheduled

20m

Charles University (Prague)

Invited talk

Speaker

Sophie Meuret (CEMES)

Description

Using an electron microscope to study the optical properties of semiconductors has sparked a lot of research over the years [1], [2] ,[3]. Indeed, despite the complexity of a TEM experiment compared to a full optical one, the increase in spatial resolution, broad excitation, and compatibility with other electron beam-based techniques has been a strong motivation. With the new generation of ultrafast TEM (UTEM), we can now investigate the dynamics of semiconductors within a TEM. Indeed since a few years, time-resolved cathodoluminescence with a UTEM was demonstrated on nanodiamonds [4], [5]. In this presentation, we will demonstrate how we can go further using a UTEM. We will show on GaN-based Nanolaser how we can use photon induced electron microscopy (PINEM) to image the dynamic of stimulated emission during the lasing cycle [6] and combine it to time-resolved cathodoluminescence to draw a full picture of the dynamic of the carriers and lasing properties at the nanoscale.

[1] L. F. Zagonel et al., « Nanometer-scale monitoring of quantum-confined Stark effect and emission efficiency droop in multiple GaN/AlN quantum disks in nanowires », Phys. Rev. B, vol. 93, no 20, p. 205410, mai 2016, doi: 10.1103/PhysRevB.93.205410.
[2] A. Gundimeda, G. Kusch, M. Frentrup, M. J. Kappers, D. J. Wallis, et R. A. Oliver, « Cathodoluminescence studies of the optical properties of a zincblende InGaN/GaN single quantum well », Nanotechnology, vol. 35, no 39, p. 395705, sept. 2024, doi: 10.1088/1361-6528/ad5db4.
[3] L. H. G. Tizei et M. Kociak, « Spatially Resolved Quantum Nano-Optics of Single Photons Using an Electron Microscope », Phys. Rev. Lett., vol. 110, no 15, p. 153604, avr. 2013, doi: 10.1103/PhysRevLett.110.153604.
[4] S. Meuret et al., « Time-resolved cathodoluminescence in an ultrafast transmission electron microscope », Applied Physics Letters, vol. 119, no 6, p. 062106, août 2021, doi: 10.1063/5.0057861.
[5] Y.-J. Kim et O.-H. Kwon, « Cathodoluminescence in Ultrafast Electron Microscopy », ACS Nano, vol. 15, no 12, p. 19480‑19489, déc. 2021, doi: 10.1021/acsnano.1c06260.
[6] C. Santini et al., « Ultrafast near-field imaging of an operating nanolaser using free electrons », 24 mars 2026, arXiv: arXiv:2603.23237. doi: 10.48550/arXiv.2603.23237.