High Efficiency Ultra-Thin Normal-Incidence Ge-On-Si Photodetector Based on Optical Metasurface
Chen Zhang,
Weixi Lin,
Zhengtong Liu
et al.
Abstract:The much thicker intrinsic absorption layer (IAL) in normal-incidence Ge-on-Si photodetectors (NIPD) usually causes a contradiction between responsivity and bandwidth. In response to this issue, here, we simulate the design of an NIPD with geranium (Ge) layers based on a “fishnet” metasurface, leading to a reduced device thickness as thin as 380[Formula: see text]nm. The optical simulation results show that the light field can be perfectly localized in the 210[Formula: see text]nm IAL, and the absorptivity is … Show more
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