Abstract
We design, fabricate, and characterize slow light devices based on photonic crystal waveguides (PhCWs) in the mid-infrared wavelength range of $3.9-3.98 \mu \mathrm{m}$ . Lattice shifting and thermo-optic tuning methods are employed to manipulate the slow light region for potential spectroscopy sensing applications. Up to 20 nm wavelength shift of the slow light band edge is demonstrated. Normalized delay-bandwidth products as high as 0.084-0.112 are obtained thanks to dispersion engineering. The slow light enhancement effect of thermo-optic tuning efficiency is verified by the proportional relationship between the phase shift and the group index. This work serves as a proof-of-concept that slow light effect can strengthen light-matter interaction and thereby improve device performance in sensing and nonlinearity applications.
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