研究目的
Investigating the control of waveguide dispersion through a hybrid chalcogenide/silicon-germanium system for mid-infrared supercontinuum generation.
研究成果
The addition of a chalcogenide top cladding to a SiGe/Si waveguide allows for post-process tuning of the waveguide dispersion, enabling control over supercontinuum generation properties. This approach offers a complementary tool for optimizing chip-based supercontinuum generation, with potential applications in biomedical imaging, medical and environmental sensors, food quality analysis, and security.
研究不足
The study is subject to fabrication inaccuracies, surface contamination, and the presence of defects. The impact of the chalcogenide surface roughness on optical losses is considered limited but not negligible.
1：Experimental Design and Method Selection:
The study involves adding a chalcogenide top cladding to a SiGe/Si waveguide to alter its dispersive properties. The impact on supercontinuum generation is examined.
2：Sample Selection and Data Sources:
A 3.75 × 2.7 μm2 cross section, 5 cm long Si0.6Ge0.4 on a Si waveguide is used, coated with a 1.26 μm thick layer of Ge11.5As24Se64.5 chalcogenide.
3：75 × 7 μm2 cross section, 5 cm long Si6Ge4 on a Si waveguide is used, coated with a 26 μm thick layer of Ge5As24Se5 chalcogenide.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Scanning electron microscope (SEM), atomic force microscope (AFM), tunable OPA laser source (MIROPA-fs, Hotlight Systems), liquid-nitrogen-cooled MCT (HgCdTe) photodetector.
4：Experimental Procedures and Operational Workflow:
The waveguide is pumped at 4.15 μm with ～200 fs pulses. The output spectrum is recorded for increasing coupled peak power.
5：15 μm with ～200 fs pulses. The output spectrum is recorded for increasing coupled peak power.
Data Analysis Methods:
5. Data Analysis Methods: The supercontinuum generation process is simulated by numerically solving the nonlinear Schr?dinger equation using the split-step Fourier method.
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