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Multimode phase-matched third-harmonic generation in sub-micrometer-wide anatase TiO₂ waveguides
Optics Express
|April 4, 2015
Summary
Researchers demonstrate on-chip third-harmonic generation (THG) using titanium dioxide waveguides. This breakthrough enables efficient wavelength conversion for quantum technologies and new photonic applications.
Area of Science:
- Photonics and Materials Science
- Integrated Optics
- Nonlinear Optics
Background:
- Third-harmonic generation (THG) is crucial for wavelength conversion and quantum photonics.
- On-chip THG is challenging due to difficulties adapting bulk techniques to integrated photonic circuits.
Purpose of the Study:
- To demonstrate on-chip third-harmonic generation (THG) using a CMOS-compatible platform.
- To explore the potential of sub-micrometer-wide polycrystalline anatase TiO₂ waveguides for integrated THG.
Main Methods:
- Fabrication of sub-micrometer-wide polycrystalline anatase TiO₂ waveguides.
- Demonstration of THG using femtosecond pulses.
- Correlation of conversion efficiency with phase-matching conditions between fundamental and higher-order modes.
Main Results:
- Achieved on-chip THG on a CMOS-compatible platform using TiO₂ waveguides.
- Observed high conversion efficiencies, estimated up to 2.5% using scattered light.
- Correlated higher efficiencies with phase-matching between pump and higher-order signal modes.
Conclusions:
- Multimode TiO₂ waveguides are promising for on-chip wavelength conversion.
- Demonstrated potential for wideband conversion and applications in sensors and triplet-photon sources.
