Giant Nonlinear Response of Subwavelength Dielectric Resonators Enhanced by Bound States in the Continuum
Authors: Koshelev KL., Carletti L., De Angelis C., Kivshar YS.
Autors Affiliation: ITMO Univ, Dept Nanophoton & Metamat, St Petersburg 197101, Russia; Univ Brescia, INO CNR, Dept Informat Engn, Via Branze 38-45, I-25123 Brescia, Italy; Australian Natl Univ, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia
Abstract: We reveal that nonlinear effects at the nanoscale can be enhanced by bound states in the continuum. We demonstrate SHG from subwavelength AlGaAs nanoantennas with record-high conversion efficiency that exceeds by two orders of magnitude the conversion efficiency observed at the conditions of magnetic dipole Mie resonances. This gain is achieved due to the engineering of the mode structure that allows exploiting a high-Q supercavity mode at the fundamental frequency. These results constitute a significant step towards the development of highly-efficient frequency conversion metadevices in the subwavelength circuitry.
More Information: 2018 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS-TOYAMA)
Edited by:Chew, WC; He, S
Book Series: Progress in Electromagnetics Research Symposium
Pages: 580-584 KeyWords: 2ND-HARMONIC GENERATION; OPTICS; LIGHT