Figure. 6
From: Bifocal flat lens with different imaging characteristics for a dual-sensor imaging system

Imaging quality testing of the short focus. (a) Resolution image taken by the FZP. (b) Resolution image taken by the BDL. (c) Focal spot at short focal plane of the FZP. (d) Focal spot at short focal plane of the BDL. (e) Actual object image taken by FZP. (f) Actual object image taken by the BDL.