Simultaneous AoLP and DoLP Detection in a Bias-Switchable PdSe/MoS/PdSe Heterojunction for Polarization Discrimination.

On-chip polarized photodetectors play a crucial role in advancing ultra-compact optoelectronic devices for next-generation technologies. However, simultaneously detecting the angle of linear polarization (AoLP) and the degree of linear polarization (DoLP) within a single device remains a challenging task, particularly due to the inherently weak polarization states found in naturally anisotropic materials. In this paper, it is reported on the development of a twisted monopole barrier photodetector based on a PdSe/MoS/PdSe configuration. This photodetector features a rapid response time of 7-12 µs. In an imaging demonstration, it operates as a single-polarization photodetector, reconstructing AoLP and DoLP distributions of target objects through bias-switchable polarization detection across a wide spectral range, all without the plasmonic/metasurface nanostructures or polarization filters. Additionally, it demonstrates bipolar characteristics under zero-bias conditions at room temperature, enabling dual-binary coding for polarimetric-encoded communication. These combination of features positions the photodetector as a highly promising candidate for on-chip applications.