Tunable frequency matching for efficient four-wave-mixing Bragg scattering in microrings

Area of Science:

• Photonics
• Quantum Optics
• Materials Science

Background:

• Four-wave mixing (FWM) is crucial for frequency conversion.
• Microring resonators offer compact platforms for nonlinear optical processes.
• Achieving efficient FWM requires precise phase-matching, which is challenging across different wavelengths.

Purpose of the Study:

• To propose and theoretically investigate a tunable frequency matching method for FWM Bragg scattering.
• To enable efficient and adaptable frequency conversion in microring resonators.

Main Methods:

• Designed a tunable coupling mechanism between clockwise and counterclockwise modes in microring resonators.
• Introduced adjustable mode splitting to compensate for frequency mismatches.
• Utilized numerical simulations on a silicon nitride ring resonator model.

Main Results:

• Demonstrated a tuning bandwidth approaching 35 free spectral ranges (FSRs).
• Validated the phase-matching strategy across various wavelength combinations.
• Confirmed robustness against variations in waveguide geometry and fabrication.

Conclusions:

• The proposed method offers a viable solution for high-efficiency frequency conversion.
• This technique has significant potential for integrated nonlinear photonics and quantum optics applications.
• The tunable coupling provides a new degree of control for light manipulation in resonators.