Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 6, Pages 7826-7832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21948
Keywords
microlens array; surface energy; patterned hydrophobic layer; selective wetting; self-assembly
Funding
- National Natural Science Foundation of China (NSFC) [61805066]
- China Postdoctoral Science Foundation [2019 M652168]
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We report a microlens array with a controllable focal length that is based on a selective wetting surface. A substrate modified with a hydrophobic layer that has an array of microholes exhibits different wettability for inside holes (hydrophilic) versus outside holes (hydrophobic). When liquid flows over the surface, a small amount of liquid is adhered to hydrophilic holes and forms a lens-shaped droplet array that self-assembles because of surface tension. A large-sized piano-convex lens array that has good uniformity is obtained via the blade coating method, and controlling the amount of liquid enables control of the focal length. Our self-assembled microlens array has the merits of high optical performance, a simple fabrication procedure, and good mechanical stability, and thus, it has potential applications in imaging processing, light extraction, protein detection, light-emitting diodes, sensors, and displays.
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