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Directionally induced quasi-phase matching in homogeneous AlGaAs waveguides
Optics Letters
|November 1, 2017
Summary
We demonstrate quasi-phase matching in a snake-shaped aluminum gallium arsenide (AlGaAs) nanowire, achieving efficient second-harmonic generation for optical telecom applications. This novel design offers enhanced control for on-chip photonic devices.
Area of Science:
- Nonlinear optics
- Materials science
- Nanophotonics
Background:
- Quasi-phase matching is crucial for efficient nonlinear optical processes.
- Whispering-gallery-mode microdisks are known for enhancing light-matter interactions.
- AlGaAs nanowires offer promising nonlinear optical properties.
Purpose of the Study:
- To experimentally observe quasi-phase matching in a homogeneous waveguide.
- To demonstrate a novel snake-shaped AlGaAs nanowire for nonlinear photonics.
- To explore the potential for on-chip nonlinear photonic devices.
Main Methods:
- Fabrication of a monolithic snake-shaped suspended AlGaAs nanowire on a GaAs wafer.
- Utilizing a whispering-gallery-mode microdisk configuration.
- Characterizing second-harmonic generation in the optical telecom wavelength range.
Main Results:
- Observed quasi-phase matching in the snake-shaped AlGaAs nanowire.
- Achieved second-harmonic generation in the optical telecom range.
- Demonstrated a spectral splitting of second-harmonic light dependent on the radius of curvature.
Conclusions:
- The snake-shaped AlGaAs nanowire acts as an unraveled χ(2) whispering-gallery-mode microdisk.
- The observed spectral splitting provides a design degree of freedom for miniaturized nonlinear photonic devices.
- This approach is promising for developing compact on-chip nonlinear optical devices.
