Nature CommunicationsUnconventional high-harmonic generation in resonant membrane metasurfacesPavel TonkaevFelix RichterIvan ToftulMaria Antonietta VincentiIvan SinevMichael ScaloraHatice AltugYuri Kivshar2025-12-22Full textDOI https://doi.org/10.1038/s41467-025-67871-6