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Dispersion engineering for broadband visible microcombs via mode hybridization and inverse design
Optics Letters
|February 28, 2025
Summary
Researchers developed a simple method for dispersion engineering in lithium niobate microring resonators (MRRs). This approach enables broadband frequency comb generation for applications in bioimaging and atomic clocks.
Area of Science:
- Photonics and optical engineering
- Materials science
- Nonlinear optics
Background:
- Lithium niobate microring resonators (MRRs) are crucial for nonlinear optical applications.
- Achieving broadband frequency combs in the visible spectrum from MRRs is challenging due to dispersion limitations.
Purpose of the Study:
- To develop a reliable and simple method for dispersion engineering in lithium niobate MRRs.
- To achieve broadband frequency comb generation near 525 nm.
- To demonstrate the generation of a visible Kerr soliton microcomb.
Main Methods:
- Utilizing strong coupling-induced mode hybridization.
- Employing an inverse design method with a neural network.
- Overcoming large normal dispersion inherent in lithium niobate MRRs.
Main Results:
- Achieved broadband frequency comb coverage near 525 nm.
- Demonstrated the generation of a visible Kerr soliton microcomb with a bandwidth of 214.4 nm in a single MRR.
- Neural network-based inverse design outperformed traditional forward design methods.
Conclusions:
- The proposed approach offers a reliable and simple way for dispersion engineering in lithium niobate MRRs.
- The generated visible Kerr soliton microcomb has significant potential for bioimaging and on-chip atomic clocks.
- Neural network-assisted inverse design is an effective tool for photonic device optimization.
