Imaging Components, Systems, and Processing

Fabrication of microlens array and bifocal microlens using the methods of laser ablation and solvent reflow

[+] Author Affiliations
Cheng-Chian Yu

National Chung Cheng University, Department of Mechanical Engineering, 168 University Road, Chiayi 62101, Taiwan

Jeng-Rong Ho

National Central University, Department of Mechanical Engineering, 300 Jhongda Road, Jhongli, Taoyuan 32001, Taiwan

Opt. Eng. 54(12), 123109 (Dec 21, 2015). doi:10.1117/1.OE.54.12.123109
History: Received July 31, 2015; Accepted November 23, 2015
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Abstract.  Based on the techniques of laser microdrilling and solvent reflow, this study reports on a straightforward approach for fabricating plastic microlens arrays (MLAs). First, we use the ArF excimer laser to drill microholes on a polymethylmethacrylate plate for defining the lens number, initial depth, and diameter. The propylene glycol monomethyl ether acetate solvent is then employed to regulate the surface profile that leads to a resulting negative (concave) MLA. The corresponding positive (convex), polydimethyl-siloxane MLA is obtained by the soft-replica-molding technique. Through varying the pattern size and period on the mask and the light intensity for laser drilling and regulating the solvent in the reflow process, we exhibit the feasibility of making MLAs with various sizes and shapes. By modifying the laser ablation step to drill two microholes with different diameters and depths at two levels, we fabricate a bifocal microlens. The obtained microlenses have excellent surface and optical properties: surface roughness down to several nanometers and focal lengths varying from hundreds to thousands of micrometers. This approach is flexible for constructing microlenses with various sizes and shapes and can fabricate MLAs with a high fill factor.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Cheng-Chian Yu and Jeng-Rong Ho
"Fabrication of microlens array and bifocal microlens using the methods of laser ablation and solvent reflow", Opt. Eng. 54(12), 123109 (Dec 21, 2015). ; http://dx.doi.org/10.1117/1.OE.54.12.123109


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