Dual-Polarization-Sensitive Organic Photodetectors for Real-Time Polarimetric Imaging

The dynamic analysis of light polarization is foundational to advances in imaging, sensing, and optical communications, yet existing polarimetric detection technologies often rely on complex, bulky assemblies of polarization optics. In this work, we report a bias-controllable dual-polarization-sensitive organic photodetector (OPD) enabled by the orthogonal assembly of uniaxially oriented polymer layers. Highly ordered nanostructured alignment of π-conjugated polymer blend photoactive layers is accomplished by sequentially stacking films with orthogonal molecular orientations, using a scalable floating film transfer method. This template-free strategy delivers exceptional polarization sensitivity, yielding a dichroic ratio exceeding 11 at 630 nm, and uniquely enables selective detection of orthogonally polarized light by modulating the bias polarity across the OPD. Robust interfacial engineering enables high specific detectivity (up to 10¹³ Jones), rapid response (>500 Hz), and a broad dynamic range, as demonstrated in real-time, bias-switchable polarimetric imaging. This solution-processable approach provides a versatile platform for integrating advanced polarization-resolved photodetection into future technologies, including adaptive imaging, mobile sensing, and next-generation wearable nano-optoelectronics.