Observation of highly efficient second-harmonic generation at the nanoscale driven by bound states in the continuum

Kirill Koshelev, Sergey Kruk, Elizaveta Melik-Gaykazyan, Jae Hyuck Choi, Andrey Bogdanov, Hong Gyu Park, Yuri Kivshar

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Recent developments in the physics of Mie-resonant high-index dielectric nanostructures suggested a promising pathway to improve efficiencies of the nonlinear light conversion beyond the limits imposed by plasmonics. Here, we employ the concept of bound states in the continuum to experimentally demonstrate a sharp enhancement of the second-harmonic generation efficiency at localized states formed via destructive interference of two leaky modes. For an AlGaAs subwavelength disk with optimized parameters, pumped with a structured light and placed on an engineered multilayered substrate, we observe the record-high conversion efficiency compared to the previous demonstrations with isolated subwavelength resonators.

    Original languageEnglish
    Title of host publicationHigh Contrast Metastructures IX
    EditorsConnie J. Chang-Hasnain, Andrei Faraon, Weimin Zhou
    PublisherSPIE
    ISBN (Electronic)9781510633438
    DOIs
    Publication statusPublished - 2020
    EventHigh Contrast Metastructures IX 2020 - San Francisco, United States
    Duration: 2020 Feb 32020 Feb 6

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume11290
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X

    Conference

    ConferenceHigh Contrast Metastructures IX 2020
    Country/TerritoryUnited States
    CitySan Francisco
    Period20/2/320/2/6

    Bibliographical note

    Publisher Copyright:
    © 2020 SPIE.

    Keywords

    • Bound states in the continuum
    • Meta-optics
    • Nanoantenna
    • Second-harmonic generation
    • Structured light
    • Subwavelength resonator

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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