Abstract
AbstractThe delicate nature of optical components requires very special handling and storage procedures to maximize their performance and lifetime. In the optical field, a long‐standing challenge is the cleaning of unavoidable contaminants during the daily use, especially for the coated elements and the biomedical diagnostic devices. Herein, the authors tackle this problem and experimentally demonstrate TiO2 based self‐cleaning optical meta‐devices with the illuminating of UV light. By arranging TiO2 nanopillars into different patterns, high‐efficiency TiO2 meta‐devices have been realized for the visible spectrum, for example, color nano‐printings, metalenses, and meta‐holograms. The TiO2 meta‐devices become hydrophilic and photoactive under UV irradiation. Consequently, the contaminants, such as, stearic acid or fingerprints have been completely cleaned. Owing to the stability of TiO2, the self‐cleaning effect and the internal nanostructures of meta‐devices are well preserved for many rounds of contamination. This research shall bring new opportunities to TiO2 metasurfaces for extreme applications.
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