β‐Ga₂O₃ Nanoribbon with Ultra‐High Solar‐Blind Ultraviolet Polarization Ratio

Abstract Solar‐blind ultraviolet (UV) detection plays a critical role in imaging and communication due to its low‐noise background, high signal‐to‐noise ratio, and strong anti‐interference capabilities. Detecting the polarization state of UV light can enhance image information and expand the communication dimension. Although polarization detection is explored in visible and infrared light, and applied in fields such as astrophysics and submarine seismic wave detection, solar‐blind UV polarization detection remains largely unreported. This is primarily due to the challenge of creating UV polarizers with high transmittance, high extinction ratio, and strong resistance to UV radiation. In this study, it is discovered that the space symmetry breaking of the β‐Ga₂O₃’s b–c plane results in a significant optical absorption dichroic ratio. Leveraging β‐Ga₂O₃’s high solar‐blind UV response, a lensless solar‐blind UV polarization‐sensitive photodetector, circumventing the challenges associated with solar‐blind UV polarizers is designed. This photodetector exhibits an exceptionally high intrinsic polarization ratio under 254 nm linearly polarized light, approximately two orders of magnitude higher than other reported nanomaterial‐based polarization‐sensitive photodetectors. Additionally, it demonstrates significant advantages in solar‐blind UV imaging and light communication. This work introduces a novel strategy for solar‐blind ultraviolet polarization detection and offers a promising approach for solar‐blind light communication.