Giant Nonlinear Response at the Nanoscale Driven by Bound States in the Continuum

Luca Carletti, Kirill Koshelev, Costantino De Angelis, and Yuri Kivshar

Phys. Rev. Lett. 121, 033903 – Published 19 July 2018

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.

Received 18 December 2017

DOI:https://doi.org/10.1103/PhysRevLett.121.033903

Physics Subject Headings (PhySH)

Nanophotonics Second order nonlinear optical processes

Atomic, Molecular & Optical

Authors & Affiliations

Luca Carletti¹, Kirill Koshelev^2,3, Costantino De Angelis¹, and Yuri Kivshar^2,3

¹Department of Information Engineering, University of Brescia, INO-CNR Via Branze 38/45, 25123 Brescia, Italy
²Nonlinear Physics Centre, Australian National University, Canberra ACT 2601, Australia
³ITMO University, St. Petersburg 197101, Russia

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Issue

Vol. 121, Iss. 3 — 20 July 2018

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