Attosecond pulse generation using high-order harmonic generation in argon gas based on the enhancement effect of multilayer plasmonicsSakineh Nazarpoor, Masoud Mohebbi and Abdolrahim BaharvandEur. Phys. J. D, 80 2 (2026) 6DOI: https://doi.org/10.1140/epjd/s10053-025-01109-4