Polarized Single‐Pixel Imaging System Based on Patterned Quantum Dot Film: Synergistic Effect of Periodical Dielectric Field and Carrier Movement Anisotropy

Abstract

Polarization single‐pixel imaging system, as a rapidly developing imaging technology, has greatly benefited from the in‐depth understanding and clarification of the mechanisms behind polarization optoelectronic performance. In this work, a polarized single‐pixel imaging system has been developed, comprising a digital micro‐mirror device (DMD) and a single‐pixel detector based on a Digital Video Disc (DVD) film coated with CsPbBr3 quantum dots, and can recognize images with different polarization characteristics. Finite‐Difference Time‐Domain (FDTD) simulations and the polarized photoluminescence tests confirmed that the photons entering in the pattern film can exhibit polarization characteristics, under the influence of a dielectric field originating from the periodical pattern structure. The polarization‐dependent transient absorption tests simultaneously confirmed that the carrier movement occurring in the patterned CsPbBr3 QDs film exhibits anisotropy. For the first time, the synergistic effect of the periodic dielectric field and carrier movement anisotropy on the polarized photodetector is reported. This provides a novel approach for the design and optimization of polarization single‐pixel imaging systems based on periodically patterned nano‐structures, which is expected to promote their widespread application in fields such as optoelectronic detection and quantum information processing.