Electron-Light Interaction at the Nanoscale: Plasmon-Mapping with Electrons and Electron-Beam Shaping with Plasmons
October 17th, 2019 NAHID TALEBI Institute for Experimental and Applied Physics, Christian-Albrechts-Universität zu Kiel, Germany
Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Germany

Being able to localize light at the nanoscale, optics community has opened up a plethora of fascinating opportunities, such as enhancing the Purcell factor, nonlinear optics and higher harmonic generation, as well as designing nanooptics elements for coherent control and prospects for electronic-light interconnectors1. A general feature of localized waves is the broad linear momentum distribution and as a result, momentum orders of much higher magnitudes than the free-space light can be sustained by nanoresonators. Nanoresonators thus can act as a mediator for enhanced electron-light elastic and inelastic interactions as well, and facilitate the transfer of energy from light to the swift electrons (like electron probes in electron microscopes) and vice versa.

Here, we present the electron-light interactions from both practical and fundamental bases. Our attempts to use the transmission and scanning electron microscopes to probe the optical near-field distribution of nanostructures, by using spectroscopic tools like electron energy-loss spectroscopy and cathodoluminescence are discussed2,3. We particularly highlight our recent studies about the design of electron-driven photon sources that we will use for spectral interferometry using electron microscopes4. Additionally, we discuss about an inverse approach: using optical fields for controlling the shape of electron waves through elastic (transversal) and inelastic (longitudinal) interactions5,6. We finally outline our future prospects in the design and implementation of elements of coherent control using electron microscopes.

Seminar, October 17, 2019, 15:00. ICFO’s Seminar Room

Hosted by Prof. Javier G. de Abajo