Quantitative analysis of segmented planar imaging quality based on hierarchical multistage sampling lens array

Segmented Planar Imaging is an advanced technology for ultra-thin, high-resolution imaging with photonic integrated circuit (PIC). In this paper, a segmented planar imager with a novel hierarchical multistage sampling lens array is proposed, which can effectively improve the sampling of low and medium frequency information. Based on the novel lens array architecture, a full-chain signal level model of the segmented planar imaging system is established, considering the fill factor of lens array and the wavelength spacing of the arrayed waveguide grating in PICs. The simulation results show that the imaging quality of the segmented planar imaging system with the hierarchical multi-level sampling lens array is significantly improved, compared with the original segmented planar imaging system. Moreover, the error range and optimization options of some parameters are given based on the full-chain modeling. There is almost no influence on the system imaging results when the error of the lens array fill factor is within 5%. The imaging quality of the system is enhanced as the wavelength spacing of the arrayed waveguide grating is reduced, and arrayed waveguide grating with wavelength spacing of 10 nm is the optimal choice for the system. The results will be helpful for the optimal design of segmented planar integrated optical imaging systems.