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

Paper Details

Date Published: 30 December 2019
PDF: 2 pages
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); doi: 10.1117/12.2541214
Show Author Affiliations
Elizaveta V. Melik-Gaykazyan, The Australian National Univ. (Australia)
M.V. Lomonosov Moscow State Univ. (Russian Federation)
Kirill Koshelev, The Australian National Univ. (Australia)
ITMO Univ. (Russian Federation)
Jae-Hyuck Choi, Korea Univ. (Korea, Republic of)
Sergey Kruk, The Australian National Univ. (Australia)
Hong-Gyu Park, Korea Univ. (Korea, Republic of)
Yuri Kivshar, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 11200:
AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019
Arnan Mitchell; Halina Rubinsztein-Dunlop, Editor(s)

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