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A Microlens Array on Curved Substrates by 3D Micro Projection and Reflow Process

[+] Author Affiliations
Hao Zhang, Lei Li, David L. McCray, Allen Y. Yi

The Ohio State University, Columbus, OH

Donggang Yao

Georgia Institute of Technology, Atlanta, GA

Paper No. MSEC2012-7409, pp. 995-999; 5 pages
doi:10.1115/MSEC2012-7409
From:
  • ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing
  • ASME 2012 International Manufacturing Science and Engineering Conference
  • Notre Dame, Indiana, USA, June 4–8, 2012
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-5499-0
  • Copyright © 2012 by ASME

abstract

Microlens arrays are becoming increasingly important because of their widespread applications in optical, electronic, and energy fields. Currently, microlens array fabrication processes are mainly developed on planar substrates. For nonplanar substrates, existing fabrication methods suffer from various disadvantages. This is largely due to the inherent technical complexity of 3D microstructure fabrication processes. In this work, an innovative 3D fabrication method for microlens arrays on curved surfaces is introduced. To fabricate the microlens array, a PMMA microlens array on a curved surface was used as the projection microlens array. A thick layer of positive tone photoresist SPR 220 was spin coated on a curved, titanium-coated aluminum substrate. A pre-designed pattern was projected onto the photoresist by using a home built exposure system. The development process resulted in micro cylinders on the curved substrate. A thermal reflow process was then performed on the cylinder array, forming a microlens array. Experiments were conducted to evaluate the factors that affect the shapes of the microlenses. These factors include film thickness variation, exposure and development variation, slope of the substrate, height to width ratio and heating time in thermal reflow process. Finally microlenses were tested by using a Twyman-Green interferometer.

Copyright © 2012 by ASME

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