The article "Ionization-Induced Sub-cycle Metallization of Nanoparticles in Few-Cycle Pulses" from the Field-resolved Nano-spectroscopy (FRNS) team was featured on the cover of ACS Photonics. The cover was designed by first author Qingcao Liu and shows the metallization of nanoparticles in few-cycle laser pulses. The hallmarks for the metallization are a phase change between inner and outer fields (depicted in false color), the screening of inner fields, and a characteristic increase in the cutoff energy of emitted electrons.