Second-harmonic spectroscopy with structured beams and the observation of quasi-BIC modes in all-dielectric nanoresonators

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

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

Abstract

We report on the experimental and numerical results for the second-harmonic generation spectroscopy by doughnut-shaped cylindrical vector beams of azimuthal and radial polarizations in individual subwavelength AlGaAs particles, which support multipolar Mie resonances at the fundamental and double frequencies. We observe high-Q resonant optical modes associated with bound states in the continuum for the azimuthally polarized pump beam with the record-high efficiency (0.1%) of the up-conversion nonlinear optical process due to a strong electromagnetic field confinement. Our findings provide an important step towards a design of resonant subwavelength all-dielectric nanostructures with tailored efficiencies of nonlinear optical phenomena at the nanoscale.

Original languageEnglish
Title of host publicationAOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019
EditorsArnan Mitchell, Halina Rubinsztein-Dunlop
PublisherSPIE
ISBN (Electronic)9781510631403
DOIs
Publication statusPublished - 2019 Jan 1
EventAOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019 - Melbourne, Australia
Duration: 2019 Dec 92019 Dec 12

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11200
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceAOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019
CountryAustralia
CityMelbourne
Period19/12/919/12/12

Keywords

  • All-dielectric nanoparticles
  • Bound states in the continuum
  • Mie resonances
  • Nonlinear spectroscopy
  • Second-harmonic generation
  • Structured light
  • Vector beams

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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  • Cite this

    Melik-Gaykazyan, E. V., Koshelev, K., Choi, J. H., Kruk, S., Park, H. G., & Kivshar, Y. (2019). Second-harmonic spectroscopy with structured beams and the observation of quasi-BIC modes in all-dielectric nanoresonators. In A. Mitchell, & H. Rubinsztein-Dunlop (Eds.), AOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019 [1120007] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11200). SPIE. https://doi.org/10.1117/12.2541214