研究目的
Investigating the engineering and tuning of slow light in mid-infrared silicon-on-insulator photonic crystal waveguides for potential spectroscopy sensing applications.
研究成果
The work demonstrates dispersion-engineered PhCW slow light devices in the mid-infrared wavelength range, achieving significant tuning range and normalized delay-bandwidth products. It provides evidence of slow light enhancement effect of light-matter interaction, beneficial for improving device performance in sensing and nonlinearity applications.
研究不足
The study is limited to the mid-infrared wavelength range of 3.9-3.98 μm on the silicon-on-insulator platform. The absorption loss caused by silicon dioxide cladding becomes strong from 3.6 μm onward, potentially limiting the application range.
1：Experimental Design and Method Selection:
The study involves designing, fabricating, and characterizing slow light devices based on photonic crystal waveguides (PhCWs) in the mid-infrared wavelength range. Lattice shifting and thermo-optic tuning methods are employed to manipulate the slow light region.
2：Sample Selection and Data Sources:
The PhCW is embedded into one arm of a Mach–Zehnder interferometer (MZI) for characterization.
3：List of Experimental Equipment and Materials:
A titanium nitride (TiN) micro-heater is deployed above the Si PhC slab for thermo-optic tuning. The fabrication process is detailed in previous work.
4：Experimental Procedures and Operational Workflow:
The light from a tunable MIR laser is coupled into the Si waveguide, maintained in single mode profile, and equally divided into reference and signal arms through a Y-junction, then recombined and coupled to another fiber.
5：Data Analysis Methods:
The group index is extracted from the MZI transmission spectrum using a specific equation. The phase shifts are calculated using perturbation theory.
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