Open AccessSelf-tuning of second-harmonic generation in GaAs nanowires enabled by nonlinear absorption
Author(s) -
Luca Carletti,
Domenico de Ceglia,
Maria Antonietta Vincenti,
Costantino De Angelis
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.032480
Subject(s) - second harmonic generation , materials science , optics , absorption (acoustics) , ultrashort pulse , nonlinear optics , optoelectronics , energy conversion efficiency , wavelength , nanowire , modulation (music) , laser , physics , acoustics
We investigate the effects of nonlinear absorption of the pump beam on second-harmonic generation in GaAs nanowires. Our model includes nonlinear absorption of the pump and allows obtaining a self-consistent solution of the nonlinear Maxwell equations. First, we observe that SHG conversion efficiency can be limited from two-photon absorption and generated free-carriers depending on the pump intensity. Second, we show a method to modulate the SHG response by varying the pump beam intensity. We find that varying the pump intensity from 1 GW/cm 2 up to 15 GW/cm 2 can red-shift the SH peak wavelength up to 5 nm and modulate the conversion efficiency at a fixed pump wavelength up to 60%. Our results enable new applications of dielectric nanoresonators for nonlinear applications such as harmonic generation, optical switching, and all-optical ultrafast modulation.