Micro fabrication of microlens arrays by micro dispensing

Hsin Chung Cheng, Chau Hsiang Wang, Chiung Fang Huang, Yung Kang Shen, Yi Lin, Dong Yea Sheu, Yi Han Hu

研究成果: 雜誌貢獻文章同行評審

16 引文 斯高帕斯(Scopus)

摘要

In this study, master of the microlens arrays is fabricated using micro dispensing technology, and then electroforming technology is employed to replicate the Ni mold insert of the microlens arrays. Finally, micro hot embossing is performed to replicate the molded microlens arrays from the Ni mold insert. The resin material is used as the dispensing material, which is dropped on a glass substrate. The resin is exposed to a 380W halogen light. It becomes convex under surface tension on the glass substrate. A master for the microlens arrays is then obtained. A 150-nm-thick copper layer is sputtered on the master as an electrically conducting layer. The electroforming method replicates the Ni mold insert from the master of the microlens arrays. Finally, micro hot embossing is adopted to replicate the molded microlens arrays. The micro hot embossing experiment employs optical films of polymethylmethacrylate (PMMA) and polycarbonate (PC). The processing parameters of micro hot embossing are processing temperature, embossing pressure, embossing time, and de-molding temperature. Taguchi's method is applied to optimize the processing parameters of micro hot embossing for molded microlens arrays. An optical microscope and a surface profiler are utilized to measure the surface profile of the master, the Ni mold insert and the molded microlens arrays. AFM is employed to measure the surface roughness of the master, the Ni mold insert and the molded microlens arrays. The sag height and focal length are determined to elucidate the optical characteristics of the molded microlens arrays.
原文英語
頁(從 - 到)632-639
頁數8
期刊Polymers for Advanced Technologies
21
發行號9
DOIs
出版狀態已發佈 - 九月 2010

ASJC Scopus subject areas

  • 聚合物和塑料

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