@article{Yan2026, 
author = {Junxin Yan and Qian Li and Tianle Zeng and Qi Gao and Xueqi Guo and Yonghao Sun and Kun Ye and Zhiyan Jia and Bingchao Yang and Anmin Nie and Lixuan Liu and Congpu Mu and Shouguo Wang},
title = {Self-driven and ultrabroadband polarized photoresponse in BP/Nb2SiTe4 heterostructures for selective polarization-based encryption-decryption and recognition},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {9},
pages = {94908772},
keywords = {van der Waals heterostructure, anisotropic optical response, self-driven and broadband photodetector, polarization sensitivity, polarization-encoded encryption and decryption},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908772},
doi = {10.26599/NR.2026.94908772},
abstract = {Being able to probe the polarization states in low-symmetry two-dimensional (2D) crystals is crucial for applications in polarization-encoded encryption and decryption. However, their polarization sensitivity is restricted by the inherent optical anisotropy. Here, we demonstrate a strategy where black phosphorus (BP) is stacked on Nb2SiTe4 to form a van der Waals heterostructure, realizing a self-powered, broadband, and highly polarization-sensitive photodetector. The atomically sharp and clean interface of BP/Nb2SiTe4 heterostructures forms a strong built-in electric field, which facilitates the separation of electron–hole pairs. Furthermore, angle-dependent Raman and absorption intensities reveal significant anisotropic optical response. The BP/Nb2SiTe4 photodetector exhibits a rapid response time and broadband detection capability from 360 to 2200 nm due to the efficient charge separation and strong interlayer coupling at the heterostructure interface. Notably, the BP/Nb2SiTe4 device also exhibits a large dichroic ratio (10.4) at zero voltage under 2200 nm light illumination. Furthermore, the proof-of-concept BP/Nb2SiTe4 photodetector possesses polarization-resolved imaging and polarization-encoded encryption/decryption capabilities, providing new insights for achieving low-power and multifunctional polarization-sensitive photodetectors.}
}