Transformation optics: a time- and frequency-domain analysis of electron-energy loss spectroscopy

TL;DR

This paper introduces a novel transformation optics-based analytical method to calculate the frequency and time-domain responses of plasmonic particles in electron energy loss spectroscopy, providing deeper physical insights.

Contribution

It presents a new analytical approach using transformation optics for EELS and CL, bridging the gap between numerical simulations and physical understanding.

Findings

Enables analytical calculation of plasmonic responses

Provides physical insights into electron-beam interactions

Applicable to various plasmonic particle geometries

Abstract

Electron energy loss spectroscopy (EELS) and Cathodoluminescence (CL) play a pivotal role in many of the cutting edge experiments in plasmonics. EELS and CL experiments are usually supported by numerical simulations, which, whilst accurate, may not provide as much physical insight as analytical calculations do. Fully analytical solutions to EELS and CL systems in plasmonics are rare and difficult to obtain. This paper aims to narrow this gap by introducing a new method based on Transformation optics that allows to calculate the quasi-static frequency and time-domain response of plasmonic particles under electron beam excitation.