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Comparison between the traditional lens and two geometric grids of the proposed metalens with respect to the focusing efficiency.
| Incident angle ( degree) | Focusing efficiency (Square) (%) | Focusing efficiency (Hexagon) (%) |
|---|---|---|
| 0 | 72 | 82 |
| 30 | 73 | 77 |
| 60 | 50 | 61 |
| 85 | 32 | 45 |
