Controlling second-harmonic generation at the nanoscale with monolithic AlGaAs-on-AlOx antennas

Area of Science:

• Photonics
• Nanotechnology
• Materials Science

Background:

• Development of monolithic aluminum gallium arsenide (AlGaAs) platforms for nonlinear nanophotonics presents significant technological challenges.
• Exploring nanoscale nonlinear optics requires understanding material properties and device design.

Purpose of the Study:

• To review recent achievements in nanoscale nonlinear AlGaAs photonics using all-dielectric optical antennas.
• To investigate the physical mechanisms behind high second-order nonlinear efficiency in AlGaAs nano-antennas.
• To explore strategies for controlling second-harmonic generation directionality and radiation patterns.

Main Methods:

• Numerical and experimental investigations of second-order nonlinear optical response.
• Analysis of dipolar resonances at the fundamental frequency.
• Analysis of multipolar resonances at the second harmonic wavelength.

Main Results:

• AlGaAs nano-antennas exhibit high efficiency for second-order nonlinear interactions.
• Dipolar and multipolar resonances play a crucial role in enhancing nonlinear effects.
• Second-harmonic generation directionality can be engineered.

Conclusions:

• All-dielectric AlGaAs optical antennas offer a promising platform for efficient nanoscale nonlinear photonics.
• Resonance engineering is key to maximizing nonlinear responses and controlling light emission.
• Further development can lead to advanced photonic devices with tailored nonlinear properties.