Decoupling Power and Polarization via Bipolar BP/MoS 2 Heterojunctions for Multidimensional Imaging

ABSTRACT Polarization detectors hold significant importance for advanced light‐field analysis and highly integrated optoelectronic systems. However, traditional polarization detection schemes typically rely on bulky mechanical rotating elements or complex multi‐device cascading, which inevitably limits system response speed, footprint, and power efficiency. To address these limitations, this study demonstrates a compact single‐pixel polarization detector based on a black phosphorus/molybdenum disulfide (BP/MoS 2 ) van der Waals heterojunction. By precisely manipulating the interfacial energy‐band engineering, the device achieves unique bipolar photoresponse characteristics in a low‐power mode near zero bias (±0.01 V). Without the need for mechanical rotating parts or detector arrays, the device enables the decoupled detection of incident polarization and intensity by leveraging the inherent competition between built‐in and external electric fields. Furthermore, we propose a novel elliptical fitting algorithm based on the two‐dimensional mapping of photocurrents, successfully extracting the polarization angle and light intensity synchronously within a single detection unit. Experimental results reveal a fast response time of ∼10 µs and a favorable responsivity of 44.37 mA/W for 1550 nm light, validating the high efficiency and robustness of this sensing framework. This all‐solid‐state architecture streamlines multidimensional light‐field decoding and offers potential for highly integrated on‐chip functional imaging.