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Phase-matched second harmonic generation with on-chip GaN-on-Si microdisks.
I Roland1, M Gromovyi2, Y Zeng1
1Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Bâtiment 220, Rue André Ampère, F-91405 Orsay, France.
Scientific Reports
|October 1, 2016
Summary
We achieved phase-matched second harmonic generation in gallium nitride on silicon microdisks. This method enhances frequency conversion by tuning microdisk resonances for fundamental and harmonic waves.
Area of Science:
- Photonics
- Materials Science
- Nonlinear Optics
Background:
- Gallium nitride (GaN) on silicon offers a promising platform for integrated photonics due to its nonlinear properties.
- Microdisk resonators are essential for enhancing light-matter interactions and achieving efficient nonlinear optical processes.
Purpose of the Study:
- To demonstrate phase-matched second harmonic generation (SHG) in GaN-on-Si microdisk resonators.
- To explore the tuning of whispering gallery modes (WGMs) for optimizing SHG efficiency.
- To integrate microdisk resonators into a two-dimensional photonic circuit.
Main Methods:
- Fabrication of GaN-on-Si microdisk resonators with varying diameters (8 nm steps).
- Integration of microdisks with side-coupling bus waveguides.
- Excitation of SHG using a continuous wave laser in the telecom band.
- Characterization of WGMs for fundamental and harmonic waves.
Main Results:
- Successful demonstration of phase-matched SHG in GaN-on-Si microdisks.
- Tuning of WGMs achieved by varying microdisk diameters.
- Pronounced enhancement of frequency conversion when phase matching conditions are met, satisfying orbital momentum conservation.
Conclusions:
- GaN-on-Si microdisks are a viable platform for efficient integrated nonlinear photonics.
- Precise control over microdisk dimensions enables phase matching for enhanced frequency conversion.
- The demonstrated approach is scalable for advanced photonic integrated circuits.
