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

doi:10.1117/12.2541214

30 December 2019 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

Author Affiliations +

Proceedings Volume 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019; 1120007 (2019) https://doi.org/10.1117/12.2541214
Event: ANZCOP, 2019, Melbourne, Australia

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.

Citation Download Citation

Elizaveta V. Melik-Gaykazyan, Kirill Koshelev, Jae-Hyuck Choi, Sergey Kruk, Hong-Gyu Park, and Yuri Kivshar "Second-harmonic spectroscopy with structured beams and the observation of quasi-BIC modes in all-dielectric nanoresonators", Proc. SPIE 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, 1120007 (30 December 2019); https://doi.org/10.1117/12.2541214

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