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Wong et al. on the cover of Nano Letters

An ultrashort laser pulse (blue) excites plasmonic nanoparticles (e.g. gold nanorods), which leads to characteristic changes in the transmitted electric field (yellow). Sampling this field at frequencies reaching the petahertz domain permits to infer the plasmonic field of the nanoparticles with attosecond precision. Image credit: RMT.Bergues.