Single-shot lensless dual-mode ultraviolet imaging based on diffuser speckle modulation

Ultraviolet (UV) imaging can reveal structural flaws, fluorescent markers, and characteristic signals generated by material changes that are difficult to detect in visible-light imaging and has been applied in numerous fields. However, in traditional UV imaging, it is challenging to simultaneously acquire reflection/transmission and UV-excited fluorescence imaging, often requiring additional optical filters to eliminate interference bands. Here, we demonstrate a dual-mode UV lensless imaging method based on diffuser speckle modulation, which enables direct reconstruction of both reflection/transmission and fluorescence images from a single-shot measurement. Compared with conventional methods, our scheme eliminates the need for optical lenses and filters, enabling an ultra-compact lensless system. This approach can be further integrated with other image post-processing operations or general computer vision tasks for the development of task-oriented intelligent UV cameras.