Direct and cascaded collective third-harmonic generation in metasurfaces

Ofer Doron*, Lior Michaeli, Tal Ellenbogen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We use collective interactions in plasmonic metasurfaces to manipulate the interplay between direct and cascaded third-harmonic generation. We implement a simple case where in contrast to the direct contribution, which is mainly enhanced by the local plasmonic resonances, the cascaded contribution enhancement may be manipulated using the metasurface’s geometry, in addition to the single nanoparticle’s electrical response, by enabling the proper nonlocal interactions at the second-harmonic frequency. In addition, an anomalous phase relation of the single nanoparticle’s linear polarizability at the second-harmonic region affects the relative phase between the direct and cascaded contributions, which results in a Fano-like asymmetrical line shape of the third-harmonic generation. We demonstrate that this can be used to enhance or contrarily completely eliminate third-harmonic generation from metasurfaces over a very narrow bandwidth. Such a unique fundamental observation of the interplay between direct and cascaded third-harmonic generation in periodic resonant systems may find new applications in sensing and to control nonlinear optical phenomena.

Original languageEnglish
Pages (from-to)E71-E77
JournalJournal of the Optical Society of America B: Optical Physics
Issue number7
StatePublished - 2019


FundersFunder number
Horizon 2020 Framework Programme715362
H2020 European Research Council
European Research Council
Ministry of Science, Technology and Space81604


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