Achieving Full Field‐of‐View Single‐Detector Imaging with Scattering Medium and Triple‐Cation Perovskite Photodetectors

Abstract

A broad field‐of‐view (FOV) is essential for imaging, enabling the capture of larger scenes and finer details. Herein, Fourier single‐detector (FSI) imaging through an aperture obstacle is explored and FOV expansion with the aid of ground glass is demonstrated. The dual light‐blocking effects of the aperture obstacle and ground glass necessitate a high‐performance, ultralow‐noise detector for weak‐light imaging. Through precise interfacial engineering, a triple‐cation perovskite photodetector is developed, achieving an ultralow noise current density (2.26 × 10−13 A Hz−1/2), a high on/off ratio (1.58 × 107), and a fast response (1.83 µs), enabling effective FSI in scattering medium. The principle behind the broadened FOV is elucidated through geometric optics, the “scattering lens” effect and differential imaging. The dependence of FOV on the distance between the ground glass and the aperture obstacle is further investigated. Notably, full FOV reconstruction is achieved when the ground glass is placed directly behind the obstacle. This research offers new insights into the scattering lens effect in FSI, overcoming the bottleneck of traditional imaging techniques in achieving wide‐view imaging through aperture obstacles. This work offers a promising approach to wide‐field imaging in complex environments, enhancing potential application of FSI under scattering conditions.