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4-quasi-phase-matched interactions in GaAs microdisk cavities.
1Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. pkuo@nist.gov
Optics Letters
|November 21, 2009
Summary
Researchers demonstrate quasi-phase-matched nonlinear optical interactions in GaAs microdisks. This novel approach achieves efficient second-harmonic generation using resonant cavities, bypassing traditional domain inversion methods.
Area of Science:
- Nonlinear Optics
- Materials Science
- Optical Engineering
Background:
- Quasi-phase matching (QPM) is crucial for efficient nonlinear optical frequency conversion.
- Traditional QPM methods often require complex and precise external domain inversions.
- Materials with 4 symmetry offer an alternative route to achieving QPM.
Purpose of the Study:
- To explore quasi-phase-matched nonlinear interactions in materials with 4 symmetry.
- To investigate the combination of 4 -QPM with resonant microcavities for enhanced efficiency.
- To analyze the tuning behavior and efficiency of second-harmonic generation in a GaAs microdisk cavity.
Main Methods:
- Utilized materials with 4 symmetry (e.g., GaAs) and curved propagation geometries for intrinsic QPM.
- Integrated 4 -QPM with whispering-gallery-mode microdisk resonators.
- Investigated second-harmonic generation (SHG) tuning characteristics in the GaAs microdisk cavity.
Main Results:
- Demonstrated quasi-phase matching without external domain inversions by leveraging 4 symmetry and curved geometries.
- Achieved resonant enhancement of nonlinear optical mixing by coupling interacting waves to the microcavity.
- Estimated a 0.1% power-conversion efficiency for second-harmonic generation with milliwatt-level pumping, with minimal higher-order nonlinearities.
Conclusions:
- 4 -QPM combined with resonant microcavities offers a promising pathway for efficient nonlinear optical devices.
- GaAs microdisk cavities enable efficient second-harmonic generation with stringent but achievable tuning.
- This approach minimizes higher-order nonlinear effects, paving the way for practical applications.
