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The electronic, optical, and magnetic properties of quantum solids aredetermined by their low-energy (< 100 meV) many-body excitations. Dynamicalcharacterization and manipulation of such excitations relies on tools thatcombine nm-spatial, fs-temporal, and meV-spectral resolution. Currently,phonons and collective plasmon resonances can be imaged in nanostructures withsub-nm and 10s meV space/energy resolution using state-of-the-artenergy-filtered transmission electron microscopy (TEM), but only under staticconditions, while fs-resolved measurements are common but lack spatial orenergy resolution. Here, we demonstrate a new method of spectrally resolvedphoton-induced near-field electron microscopy (SRPINEM) that allows us toobtain nm-fs-resolved maps of nanoparticle plasmons with an energy resolutiondetermined by the laser linewidth (20 meV in this work), and not limited byelectron beam and spectrometer energy spreading. This technique can be extendedto any optically-accessible low-energy mode, thus pushing TEM to a previouslyinaccessible spectral domain with an unprecedented combination of space, energyand temporal resolution.

meV resolution in laser-assisted energy-filtered transmission electron microscopy