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Broadband second-harmonic phase-matching in dispersion engineered slot waveguides
Optics Express
|February 3, 2016
Summary
Researchers achieved broadband phase-matching for nonlinear optics on-chip. This enables efficient second-harmonic generation and optical parametric amplification in micro/nanophotonic devices.
Area of Science:
- Photonics
- Nonlinear Optics
- Materials Science
Background:
- Parametric optical nonlinearities typically require high optical intensity and phase-matching.
- Micro/nanophotonics offer high light confinement but lack broadband phase-matching solutions.
Purpose of the Study:
- To demonstrate broadband second-harmonic phase-matching on-chip using mode-coupling in slot waveguides.
- To engineer waveguide dispersion for efficient nonlinear optical processes.
Main Methods:
- Utilizing mode-coupling in slot waveguides to engineer modal dispersion.
- Employing hetero-slot waveguides with aluminum nitride (AlN) and silicon nitride (SiN).
- Incorporating a high-nonlinearity polymer cladding material.
Main Results:
- Achieved a phase-matching bandwidth of 220 nm in the mid-infrared.
- Demonstrated high normalized conversion efficiency for second-harmonic generation (SHG) and signal gain for degenerate optical parametric amplification (DOPA).
- Proposed asymmetric-slot waveguides and thermal tuning for fabrication ease.
Conclusions:
- Mode-coupling in slot waveguides enables broadband phase-matching for on-chip nonlinear optics.
- The demonstrated technique can be extended to other nonlinear frequency mixing processes.
- This work expands the possibilities for integrated nonlinear photonic applications.
