Laser-Activated Second Harmonic Generation in Flexible Membrane with Si Nanowires

Area of Science:

• Nonlinear optics
• Materials science
• Nanotechnology

Background:

• Nonlinear silicon photonics offers CMOS compatibility for diverse applications.
• Silicon nanowires (Si NWs) are studied for sensitive, tunable photonic properties and fabrication ease.
• Second harmonic generation (SHG) is a key nonlinear optical process.

Purpose of the Study:

• To fabricate and investigate the SHG properties of Si NW/siloxane flexible membranes.
• To explore laser-induced enhancement of nonlinear optical response in these membranes.
• To contribute novel methods for silicon-based nonlinear optical platforms and infrared converters.

Main Methods:

• Fabrication of highly transparent flexible membranes comprising vertical arrays of Si NWs.
• Characterization of nonlinear optical response, specifically SHG.
• Infrared laser irradiation (800-1020 nm) to induce and enhance SHG.

Main Results:

• The fabricated flexible membranes exhibited a strong nonlinear response.
• Infrared laser activation significantly enhanced the SHG signal.
• Stable SHG enhancement was observed, attributed to surface functional modifications of Si NWs.

Conclusions:

• Si NW/siloxane flexible membranes are effective for SHG.
• Laser activation provides a method for stable enhancement of nonlinear optical properties.
• This work advances silicon-based nonlinear platforms and infrared converter development.