Fundamental Limit of Plasmonic Cathodoluminescence
| Main Authors: | Franz-Philipp Schmidt, Arthur Losquin, Michal Horák, Ulrich Hohenester, Michael Stöger-Pollach, Joachim R. Krenn |
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| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2020
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/4448902 |
Daftar Isi:
- We use cathodoluminescence (CL) spectroscopy in a transmission electron microscope to probe the radial breathing mode of plasmonic silver nanodisks. A two-mirror detection system sandwiching the sample collects the CL emission in both directions, that is, backward and forward with respect to the electron beam trajectory. We unambiguously identify a spectral shift of about 8 nm in the CL spectra acquired from both sides and show that this asymmetry is induced by the electron beam itself. By numerical simulations, we confirm the observations and identify the underlying physical effect due to the interference of the CL emission patterns of an electron-beam-induced dipole and the breathing mode. This effect can ultimately limit the achievable fidelity in CL measurements on any system involving multiple excitations and should therefore be considered with care in high-precision experiments.
- This work was supported by the FWF SFB NextLite (F4905–N23), FWF under project P 31264, NAWI Graz, the Graz Centre for Electron Microscopy (ZFE), and the University Service Centre for Transmission Electron Microscopy (USTEM). This work was partially supported by European Union's Horizon 2020 program (project SINNCE, No. 810626). We thank Thomas Götsch, Christoph Pratsch, and Thomas Lunkenbein for fruitful discussions on electron-matter interaction and carbon contamination in transmission electron microscopes. M.H. acknowledges the support of Thermo Fisher Scientific and CSMS scholarship 2019.