High-harmonic generation at the nanoscale boosted by bound states in the continuum

Luca Carletti*, Sergey S. Kruk, Andrey A. Bogdanov, Costantino De Angelis, Yuri Kivshar

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    114 Citations (Scopus)

    Abstract

    Recent progress in nanoscale optics is driven by the physics of electric and magnetic resonances supported by high-index dielectric nanoparticles. Here, we exploit optical bound states in the continuum in a subwavelength particle enhanced by an engineered substrate undergoing an epsilon-near-zero transition from an insulator to a conductor, and uncover how to boost dramatically high-order parametric nonlinear effects. Our strategy makes feasible an observation of a variety of multistep cascaded and multifrequency nonlinear effects in an individual subwavelength resonator. This would expand substantially the range of applications of Mie-resonant dielectric metaphotonics for highly efficient subwavelength optical circuitry, nonlinear metadevices, ultrasensitive hyperspectral sensing, and quantum nanophotonics.

    Original languageEnglish
    Article number023016
    JournalPhysical Review Research
    Volume1
    Issue number2
    DOIs
    Publication statusPublished - Sept 2019

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