Dr. Rui Zhu Profile

Dr. Rui Zhu

at Shanghai Institute of Optics and Fine Mechanics

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Proceedings Article | 20 November 2019 Presentation + Paper

Stability of dielectric multilayer coatings for the Vacuum ultraviolet

Weili Zhang, Zhen Yu, Rui Zhu, Xiaofeng Liu, Kui Yi, Meiping Zhu, Jianda Shao

Proceedings Volume 11173, 1117313 (2019) https://doi.org/10.1117/12.2536346

KEYWORDS: Reflectivity, Optical coatings, Vacuum ultraviolet, Interfaces, Diffusion, Dielectrics, Scattering, Multilayers, Lanthanum, Contamination

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Vacuum ultraviolet (VUV) reflective coatings play an important role in many high-tech fields including cosmic physics, space research, life science and synchrotron radiation. In this research, the emphasis are focused on the aging effect of 135.6nm high reflective coatings. The coatings were deposited by resistive heating method based on Lanthanum fluoride (LaF₃) and Aluminum fluoride (AlF₃). Optical property, surface morphology and roughness, and composition were characterized in different period after deposited. Due to the porous structure and the worse stability of lanthanum fluoride, the content of C and O element increased in LaF₃ thin films during aging process. On one hand, the content of C and O are the hydrocarbon contamination from environment and packing boxes. On the other hand, due to the oxidation of film materials, the fluorides will turn into oxyfluoride, which will increase O content. As a result, there will be an increase of absorption and a decrease of reflectance of the 135.6nm high reflective coating. The surface roughness decreased which led to the reduction of scattering and the rise of reflectivity. There will be LaF₃-AlF₃ mixed layers between interfaces because of interface diffusion, which will further reduce the film performance.

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