title: Ultralong focal length microlens array fabricated based on SU-8 photoresist.
abstract: In this paper, a novel method to fabricate ultralong focal length microlens arrays has been proposed. The microlens arrays were fabricated based on surface tension when heating temperature is over a glass transition temperature of SU-8 photoresist. An ultralong focal length was achieved by the large radius of curvature of a photoresist surface. Microlenses of widths from 30 to 210 μm were successfully fabricated. The longest focal length was up to 4.4 mm from the microlens of 210 μm width. The formation mechanism was also studied and validated by simulation based on the finite element method.
authors.forename: Rui
authors.initials: R
authors.lastname: Bian
authors.forename: Ying
authors.initials: Y
authors.lastname: Xiong
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Chen
authors.forename: Penghui
authors.initials: P
authors.lastname: Xiong
authors.forename: Shuangyue
authors.initials: S
authors.lastname: Hou
authors.forename: Shan
authors.initials: S
authors.lastname: Chen
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Yangchao
authors.initials: Y
authors.lastname: Tian