Scientific Results

Self-tuning of second-harmonic generation in GaAs nanowires enabled by nonlinear absorption

Year: 2019

Authors: Carletti L., de Ceglia D., Vincenti MA., De Angelis C.

Autors Affiliation: Univ Padua, Dept Informat Engn, I-35131 Padua, Italy; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; CNR, Natl Inst Opt INO, I-25123 Brescia, Italy

Abstract: 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. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 27 (22)      Pages from: 32480  to: 32489

KeyWords: META-OPTICS; NANOANTENNAS; RESONANCES; INDEX; INP
DOI: 10.1364/OE.27.032480

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