Monolithic AlGaAs second-harmonic nanoantennas
V. F. Gili, L. Carletti, A. Locatelli, D. Rocco, M. Finazzi, L., Ghirardini, I. Favero, C. Gomez, A. Lema\^itre, M. Celebrano, C. De Angelis,, G. Leo
TL;DR
This paper presents the fabrication and experimental demonstration of monolithic AlGaAs nanoantennas that efficiently generate second harmonic signals, showcasing their potential for nonlinear optical applications.
Contribution
It introduces a novel monolithic fabrication method for AlGaAs nanoantennas using selective oxidation, achieving high second harmonic conversion efficiency.
Findings
Peak conversion efficiency exceeds 10^-5.
Optimized nanocylinder geometry enhances SHG.
Femtosecond pulse pumping at 1554 nm used for measurements.
Abstract
We demonstrate monolithic aluminum gallium arsenide (AlGaAs) optical anoantennas. Using a selective oxidation technique, we fabricate such epitaxial semiconductor nanoparticles on an aluminum oxide substrate. Second harmonic generation from an AlGaAs nanocylinder of height h=400 nm and varying radius pumped with femtosecond pulses delivered at 1554-nm wavelength has been measured, revealing a peak conversion efficiency exceeding 10-5 for nanocylinders with an otpimized geometry.
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