Table 1 Optimized parameters of the apodized imaging grating coupler.

From: High-efficiency self-focusing metamaterial grating coupler in silicon nitride with amorphous silicon overlay

 

Apodized section

Homogenous section

Number of periods

13

27

Grating pitch

639–665 nm

603–638 nm

Metamaterial index

1.45–nα-Si

Not applicable

Grating strength

0.002 – 0.047 µm−1

0.047 µm−1

Diffraction angle

 − 11° to − 21.8°

Fiber height

55 µm

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