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Second-harmonic-generation enhancement in cavity resonator integrated grating filters
Optics Letters
|November 2, 2019
Summary
We numerically and experimentally demonstrate enhanced second-harmonic generation (SHG) using a cavity resonator integrated grating filter (CRIGF). Confining the waveguide mode within the CRIGF boosts SHG power over 30 times compared to single grating couplers.
Area of Science:
- Photonics and nonlinear optics.
- Integrated optics and device fabrication.
Background:
- Second-harmonic generation (SHG) is crucial for frequency conversion in photonics.
- Integrated photonic devices offer miniaturization and enhanced light-matter interaction.
Purpose of the Study:
- To numerically and experimentally investigate second-harmonic generation (SHG) in a cavity resonator integrated grating filter (CRIGF).
- To demonstrate the significant enhancement of SHG power achievable with CRIGF technology.
Main Methods:
- Numerical modeling of SHG in lithium niobate (LiNbO3) systems.
- Experimental implementation using a CRIGF around 1550 nm.
- Excitation of waveguide modes using grating couplers and focused beams.
Main Results:
- Achieved over 30 times increase in SHG power when using a CRIGF compared to a single grating coupler.
- Demonstrated efficient SHG by confining waveguide modes within the CRIGF.
- Validated numerical models with experimental results.
Conclusions:
- CRIGFs offer a highly effective platform for enhancing nonlinear optical processes like SHG.
- The confinement of waveguide modes within resonant structures is key to boosting nonlinear efficiencies.
- This work paves the way for more efficient integrated photonic devices for frequency conversion.
