Rapid Fabrication of Continuous Surface Fresnel Microlens Array by Femtosecond Laser Focal Field Engineering.
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.
['Yan|Linyu|L|', 'Yang|Dong|D|', 'Gong|Qihuang|Q|', 'Li|Yan|Y|0000-0003-0607-3166']
femtosecond laser direct writing two-photon polymerization Fresnel lens three-dimensional focal field engineering