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Geometrical and performance parameters of the optimized directional coupler for optical chemical sensing (slot waveguides parameters are in Table 1).
| Parameter | Value |
|---|---|
| Coupler length (L) | 400 μm |
| Distance between slot waveguides (d) | 1,094.4 nm |
| Device area | 1,200 μm2 |
| SP1 (quasi-TE mode) | 500 |
| S(P1–P2) (quasi-TE mode) | 1,000 |
| Minimum detectable refractive index change | 10-5 |
| Minimum detectable glucose concentration | 0.1 g/L |
