@inproceedings{cfad256e3e0c43e688ecedbee6f4a5fd,
title = "Second-harmonic spectroscopy with structured beams and the observation of quasi-BIC modes in all-dielectric nanoresonators",
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.",
keywords = "All-dielectric nanoparticles, Bound states in the continuum, Mie resonances, Nonlinear spectroscopy, Second-harmonic generation, Structured light, Vector beams",
author = "Melik-Gaykazyan, {Elizaveta V.} and Kirill Koshelev and Choi, {Jae Hyuck} and Sergey Kruk and Park, {Hong Gyu} and Yuri Kivshar",
note = "Funding Information: The authors acknowledge a support of the Australian Research Council and thank A. Bogdanov and A. Fedyanin for collaboration. E.M.acknowledgesa supportoftheuRssianoFundationofraBsiceRsearchp(roject no. 18-32-01038). Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; AOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019 ; Conference date: 09-12-2019 Through 12-12-2019",
year = "2019",
doi = "10.1117/12.2541214",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Arnan Mitchell and Halina Rubinsztein-Dunlop",
booktitle = "AOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019",
}