Ultra-thin Silicon Photonics Meta-detector for Perfect 850-950 nm Band Tunable Absorption

We introduce a silicon photonics meta-detector for perfect 850-950 nm band tunable absorption. Optimized < λ /4.5 thin designs of 10 nm Si film wrapped by a laterally asymmetric dual SiO
2
-Air Si-SiO
2
gratings cavity, fully absorbs light of > 15µm penetration depth, in < 25 nm effectively thin Si absorber.