Enhanced Polarized Light Imaging via Dual‐Barrier Modulated Heterojunction Photodetectors

High‐performance polarized photodetectors (PDs) are crucial for image sensing and intelligent processing. Conventional detectors utilize multiple optical components, leading to complex systems that require advanced nanofabrication and customized micro‐nanostructures. This study presents a high‐performance polarization‐dependent PD utilizing the optical anisotropy and nanostructural features of three‐dimensional graphene (3D‐graphene) with a dual‐barrier modulation mechanism. The porous structure of 3D‐graphene allows differential light absorption based on incident direction, enhancing polarization selectivity, while its plasma resonator effect boosts localized electric fields. Incorporating tin dioxide quantum dots (SnO 2 QDs) further improves polarization selectivity and carrier separation, reducing recombination losses. The device operates across a spectral range of 440–1550 nm, maintaining long‐term stability from 173 to 273 K. It features a detection rate of 1.21 × 10 12 Jones, a response rate of 21.18 A/W, low noise of 2.88 × 10 −20 A 2 /Hz, and rise/fall times of 125 µs and 150 µs, respectively, with a cutoff frequency of 2.25 kHz. With a polarization ratio of 1.1, it is suited for polarization image processing and information encryption, achieving 99% recognition accuracy in detailed image reconstruction. This research provides valuable insights and foundational technical information for high‐performance polarized PDs.