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Updated: Feb 6, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
Giant Nonlinear Response at the Nanoscale Driven by Bound States in the Continuum
Luca Carletti1, Kirill Koshelev2,3, Costantino De Angelis1
1Department of Information Engineering, University of Brescia, INO-CNR Via Branze 38/45, 25123 Brescia, Italy.
Abstract:
Being motivated by the recent prediction of high-Q modes in subwavelength dielectric resonators inspired by bound states in the continuum (BIC), we study the second-harmonic generation from isolated subwavelength AlGaAs nanoantennas. We reveal that nonlinear effects at the nanoscale can be enhanced dramatically provided the resonator parameters are tuned to the BIC regime. We predict a record-high conversion efficiency for nanoscale resonators that exceeds by 2 orders of magnitude the conversion efficiency observed at the magnetic dipole Mie resonance, thus opening the way for highly efficient nonlinear metasurfaces and metadevices.
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