Fabrication of binary microlens array by excimer laser micromachining

Frank H.H. Lin, J. H. Huang, Eric H.Y. Chou, C. R. Yang, Bruce C.S. Chou, Roger K.S. Luo, W. K. Kuo, J. W. Chang, M. H. Lu, W. H. Huang, C. J. Chen

Research output: Contribution to journalConference article

Abstract

A novel technique to fabricate binary microlens on polymer substrates by 248nm KrF excimer laser micromachining is proposed. A successfully fabricated eight-level binary microlens with diameter 1.25mm and focal length 43mm on polycarbonate (PC) sheet is also reported. Using this technique, microlens patterns are mask-projected on the polymer materials via the laser ablation effect instead of complicated multi-stepped lithography and etching processes. Moreover, the precise ablated depth of microlens can be achieved by adequately controlling the number of laser pulses. In order to reduce alignment complexity and offset, multiple mask patterns are produced in one quartz plate and the mask holder is loaded by a servo-controlled x-y stage. SEM pictures and optical interference inspections show that the etched surface and sidewall have roughness deviation less than 30nm, which is compatible with those results obtained by other techniques. This technique can fabricate a 2×2 array of eight-level binary microlens in about several seconds. He-Ne laser and proper optics arrangements are used to measure the diffraction efficiency of the fabricated devices. Experimental results show that the unique technique can produce the multi-level microlens with submicrometer feature size, high-quality surface morphology, and satisfactory optical characteristics.

Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3511
DOIs
Publication statusPublished - 1998
EventMicromachining and Microfabrication Process Technology IV - Santa Clara, CA, United States
Duration: 1998 Sep 211998 Sep 22

Keywords

  • Ablation
  • Binary microlens
  • Excimer laser
  • Micromachining

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Lin, F. H. H., Huang, J. H., Chou, E. H. Y., Yang, C. R., Chou, B. C. S., Luo, R. K. S., Kuo, W. K., Chang, J. W., Lu, M. H., Huang, W. H., & Chen, C. J. (1998). Fabrication of binary microlens array by excimer laser micromachining. Proceedings of SPIE - The International Society for Optical Engineering, 3511, 67-72. https://doi.org/10.1117/12.324323