Rapid fabrication of continuous surface fresnel microlens array by femtosecond laser focal field engineering

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Abstract

Femtosecond laser direct writing through two-photon polymerization has been widely used in precision fabrication of three-dimensional microstructures but is usually time consuming. In this article, we report the rapid fabrication of continuous surface Fresnel lens array through femtosecond laser three-dimensional focal field engineering. Each Fresnel lens is formed by continuous two-photon polymerization of the two-dimensional slices of the whole structure with one-dimensional scan of the corresponding two-dimensional engineered intensity distribution. Moreover, we anneal the lens array to improve its focusing and imaging performance.

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Yan, L., Yang, D., Gong, Q., & Li, Y. (2020). Rapid fabrication of continuous surface fresnel microlens array by femtosecond laser focal field engineering. Micromachines, 11(2). https://doi.org/10.3390/mi11020112

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