Open AccessFacile fabrication of close-packed microlens arrays using photoinduced surface relief structures as templates
Author(s) -
Seung-Woo Lee,
Yong Jeong,
Jung Ki Park
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.014550
Subject(s) - microlens , materials science , fabrication , template , optics , grating , photopolymer , optoelectronics , surface (topology) , mold , nanotechnology , polymer , composite material , lens (geology) , medicine , physics , alternative medicine , pathology , polymerization , geometry , mathematics
We demonstrate the cost-effective and facile method of fabricating close-packed microlens arrays using photoinduced two-dimensional (2-D) surface relief structures as original templates. 2-D surface relief structures are produced by successive inscription of two beams interference patterns with different grating vectors on azopolymer films. The employed exposure dose of 1st inscription stage and 2nd inscription stage are optimized to obtain symmetrical modulation heights. These photoinduced 2-D surface relief structures on azopolymer films are used directly to mold PDMS, and PDMS molds were then transferred onto photopolymer to imprint microlens arrays. Using this method, tetragonally and hexagonally close-packed microlens arrays are successfully fabricated in rapid and cost-effective way.