Four-wave mixing Bragg scattering in hydrogenated amorphous silicon waveguides

Area of Science:

• Photonics
• Integrated Optics
• Nonlinear Optics

Background:

• Four-wave mixing (FWM) is a key nonlinear optical process for generating new frequencies.
• Bragg scattering offers a resonant enhancement mechanism for nonlinear interactions.
• Hydrogenated amorphous silicon (a-Si:H) is a promising material for integrated photonics due to its nonlinear properties.

Purpose of the Study:

• To demonstrate efficient on-chip four-wave mixing Bragg scattering.
• To investigate the conversion efficiency and operational bandwidth in a hydrogenated amorphous silicon waveguide.
• To determine the required pump powers for achieving high conversion efficiency.

Main Methods:

• Fabrication of a hydrogenated amorphous silicon waveguide.
• Experimental setup for four-wave mixing Bragg scattering.
• Measurement of on-chip conversion efficiency and operational bandwidth.

Main Results:

• Achieved 15% on-chip conversion efficiency for FWM Bragg scattering.
• Required low peak pump powers of 55 mW and 194 mW.
• Demonstrated an operational bandwidth greater than 4 nm.
• Maintained lightwaves within the telecommunication band.

Conclusions:

• Hydrogenated amorphous silicon waveguides enable highly efficient FWM Bragg scattering.
• The demonstrated efficiency is achieved with practical, low pump power levels.
• The wide operational bandwidth is suitable for telecommunication applications.