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


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
ISBN (Electronic)9781510633438
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
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHigh Contrast Metastructures IX 2020
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© 2020 SPIE.


  • 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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