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Plasmon resonances are known to amplify the electromagnetic fields near metallic nanostructures. Therefore, they are considered to provide a promising scheme to generate extreme-ultraviolet harmonics, using low power drivings. During high-order harmonic generation (HHG), the driving and harmonic fields accumulate a phase difference as they propagate through the target. In a typical set-up -a laser focused into a gas jet or cell- the propagation distances amount to several wavelengths, and thedoi:10.1364/oe.25.014974 pmid:28788933 fatcat:yc5i2efwgjhojngg5pvbhwptsa