these devices is the bottleneck problem in the development of optoelectronic metadevices33. In this work, we address this challenge by discovering and exploiting an effect of intrinsic anisotropic photogating induced band modulation. Photogating induced conductance modulation is a well- known effect that enables ultrahigh gain in phototransistors34–37. This effect stems from the additional gating voltage generated by trapped photocarriers, and it tends to occur in low-dimensional materials or at the interfaces between low-dimensional materials and their supporting substrates34,38,39. Here, it is discovered that the photogating effect becomes polarization dependent in an intrinsic anisotropic detection material, such as black phosphorus (BP). We establish a meta- polarization-detector consisting of a piece of BP partially supported by SiO2 with trap states and partially supported by hBN with almost no trap states. The BP not only functions as a detection material, but also forms a metastructure with the hBN and the SiO2 to generate aniso- tropic photogating-induced band modulation. Light i
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High discrimination infrared polarimetry via intrinsic anisotropic photogating in black phosphorus meta-polarization detectors
Yonghao Bu, Tao Ye, Ruowen Wang, Jing Zhou, Jie Deng, Yuran Zhen, Mengdie Shi, Wenji Jing, Rui Xin, Yujie Zhang, Junwei Huang, Tianxin Li, Wei Lu, Xiaoshuang Chen
Research context
Filterless miniaturized polarization photodetectors are essential for next-generation ultracompact optical and optoelectronic systems. However, achieving high polarization discrimination and high sensitivity over a broad wavelength range based on a simple device structure remains difficult. Here, we address this challenge by leveraging a band modulation effect induced by intrinsic anisotropic photogating. We realize a meta-polarization-detector consisting of a black phosphorus (BP) flake partially supported by SiO2 with trap states and partially supported by hexagonal boron nitride (hBN) with almost no trap states. The band distribution and hence the self-powered photocurrent are significantly influenced by light illumination in a polarization dependent manner. The polarization extinction ratio (PER) tending to ∞/−∞ is achieved over the near- to mid-infrared range with high specific detectivity. Further, our device achieves PER = ∞/−∞ under blackbody radiation. The specific polarization angle detectivity reaches 3 × 107 cm Hz0.5 W−1 degree−1. Despite utilizing the photogating effect, the photoresponse times are of the order of microseconds. Our work provides a promising approach fo
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Yonghao Bu, Tao Ye, Ruowen Wang, Jing Zhou, Jie Deng, Yuran Zhen, Mengdie Shi, Wenji Jing, Rui Xin, Yujie Zhang, Junwei Huang, Tianxin Li, Wei Lu, Xiaoshuang Chen. High discrimination infrared polarimetry via intrinsic anisotropic photogating in black phosphorus meta-polarization detectors. Nature Communications (2025). https://doi.org/10.1038/s41467-025-65128-w
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