Table 1 Examples to show the lattice constraints on NAs of metalenses
From: Dielectric metalens for miniaturized imaging systems: progress and challenges
Ref. | λ (nm) | p (nm) | λ/(2p) | Reported NA | Focusing efficiency | Minimal size; height | Material; phase control |
|---|---|---|---|---|---|---|---|
Science 201641 | 405 | 200 | 1.01 | 0.8 (air) | 0.86 | 136.6 nm; 600 nm | TiO2; PB phase |
532 | 325 | 0.82 | Â | 0.73 | Â | Â | |
660 | 430 | 0.77 | Â | 0.66 | Â | Â | |
Nano Lett. 201745 | 405 | 150 | 1.35 | 1.1 (water) | 0.53 | 108.7 nm; 600 nm | TiO2; PB phase |
532 | 240 | 1.108 | Â | Â | Â | Â | |
Nano Lett. 201847 | 532 | 220 | 1.209 | 0.98 (air) | 0.48 | 36.2 nm; 500 nm | c-Si; PB phase |
| Â | Â | Â | 1.48 (oil) | Â | Â | Â | |
Phys. Rev. Appl. 201846 | 633 | 416 | 0.76 | 0.98 (air) | Divergent | 173.75 nm; 695 nm | Si3N4; Propagation phase |
Nat. Commun. 201948 | 700 | 300 | 1.167 | 1.1 (solid) | – | 100 nm; 1000 nm | Diamond; Propagation phase |
