Gallium indium phosphide microstructures with suppressed photoluminescence for applications in nonlinear optics

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Gallium indium phosphide (GaInP) is a semiconductor with a direct band gap, exhibiting significant second-order nonlinear optical properties.
• Strong photoluminescence (PL) is characteristic of GaInP due to its direct band gap, which can be a limiting factor in certain photonic applications.

Purpose of the Study:

• To investigate the suppression of photoluminescence in GaInP waveguides while maintaining their nonlinear optical characteristics.
• To assess the suitability of GaInP for low-noise photonic applications by decoupling PL from nonlinear effects.

Main Methods:

• Fabrication of GaInP microwaveguides with dimensions (0.2×11×1300 μm).
• Measurement of second-harmonic generation (SHG) to quantify nonlinear properties.
• Stimulation of intrinsic photobleaching to suppress photoluminescence.

Main Results:

• Photoluminescence in GaInP waveguides was significantly suppressed by up to -34 dB through photobleaching.
• The second-order nonlinear properties of the GaInP waveguides remained unaffected after PL suppression.
• Demonstrated decoupling of photoluminescence from nonlinear optical response.

Conclusions:

• GaInP waveguides can be engineered to suppress photoluminescence while preserving their inherent nonlinear optical properties.
• The ability to reduce PL makes GaInP a promising material for low-noise nonlinear photonic devices.
• This research opens avenues for advanced optoelectronic applications requiring minimal optical noise.