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Cathodoluminescence spectroscopy performed in an electron microscope hasproven a versatile tool for analysing the near- and far-field optical responseof plasmonic and dielectric nanostructures. Nevertheless, the transitionradiation produced by electron impact is often disregarded in theinterpretation of the spectra recorded from resonant nanoparticles. Here weshow, experimentally and theoretically, that transition radiation can by itselfgenerate distinct resonances which, depending on the time of flight of theelectron beam inside the particle, can result from constructive or destructiveinterference in time. Superimposed on the eigenmodes of the investigatedstructures, these resonances can distort the recorded spectrum and lead topotentially erroneous assignment of modal characters to the spectral features.We develop an intuitive analogy that helps distinguish between the twocontributions. As an example, we focus on the case of silicon nanospheres, andshow that our analysis facilitates the unambiguous interpretation ofexperimental measurements on Mie-resonant nanoparticles.

Disentangling cathodoluminescence spectra in nanophotonics: particle eigenmodes vs transition radiation