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Concurrent phase-matchings for multi-wavelength conversion in coupled dual waveguides.
Optics Express
|November 22, 2024
Summary
Researchers demonstrated concurrent phase-matchings for multi-wavelength conversion in coupled thin film lithium niobate waveguides. This breakthrough, achieved without poling, enables tunable on-chip nonlinear optical processes for nanophotonics and quantum optics applications.
Area of Science:
- Integrated photonics
- Nonlinear optics
- Thin film lithium niobate
Background:
- Thin film lithium niobate (TFLN) is a key material for integrated photonics due to its strong second-order nonlinear properties.
- Wavelength conversion is crucial for various photonic applications, but efficient on-chip methods are challenging.
Purpose of the Study:
- To demonstrate concurrent phase-matchings for multi-wavelength conversion in TFLN waveguides.
- To achieve this without employing the conventional poling technique.
- To explore the tunability of phase-matching conditions.
Main Methods:
- Utilized coupled dual waveguide structures in TFLN.
- Employed modal phase-matching principles.
- Investigated the impact of waveguide gap on phase-matching conditions for second harmonic generation.
Main Results:
- Successfully demonstrated concurrent phase-matchings for multi-wavelength conversion.
- Validated three effective phase-matching conditions for second harmonic generation.
- Showcased tunability of phase-matching wavelengths by adjusting the waveguide gap.
Conclusions:
- Coupled dual waveguide systems in TFLN offer a novel approach for on-chip nonlinear optics.
- The demonstrated method is extendable to other nonlinear processes like difference frequency generation and spontaneous parametric down conversion.
- This work advances efficient on-chip nonlinear optical processes for nanophotonics and quantum optics.
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