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Tunable photo-induced second-harmonic generation in a mode-engineered silicon nitride microresonator
Optics Express
|May 9, 2023
Summary
All-optical poling in silicon nitride integrated photonics enables efficient second-harmonic generation. This study demonstrates tunable, milliwatt-level output from a microresonator, crucial for photonic device applications.
Area of Science:
- Integrated photonics
- Nonlinear optics
- Materials science
Background:
- Silicon nitride photonics offers unique nonlinear properties.
- Efficient second-harmonic generation (SHG) is key for frequency conversion.
- All-optical poling provides reconfigurable quasi-phase-matching.
Purpose of the Study:
- To demonstrate broadly tunable, milliwatt-level SHG in silicon nitride.
- To achieve simultaneous critical coupling of pump and efficient SHG extraction.
- To enable reconfigurable quasi-phase-matching in integrated photonic devices.
Main Methods:
- Fabrication of a silicon nitride microresonator with engineered coupling.
- Utilizing all-optical poling for quasi-phase-matching.
- Employing thermal tuning with an integrated heater for tunability.
Main Results:
- Achieved broadly tunable, milliwatt-level SHG.
- Demonstrated simultaneous critical coupling of the pump and efficient SHG extraction.
- Showcased thermal tuning over a 10 nm band with a 47 GHz frequency grid.
Conclusions:
- All-optical poling is effective for reconfigurable quasi-phase-matching in silicon nitride.
- The demonstrated microresonator enables efficient and tunable frequency conversion.
- This work advances silicon nitride integrated photonics for nonlinear applications.
