ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Polymer Deformable Mirror for Optical Auto Focusing

  • Wang, Jen-Liang (Graduate Institute of Electro-Optical Engineering, National Taiwan University) ;
  • Chen, Tyng-Yow (Graduate Institute of Electro-Optical Engineering, National Taiwan University) ;
  • Liu, Chingwei (Graduate Institute of Electro-Optical Engineering, National Taiwan University) ;
  • Chiu, Chen-Wei Edward (Graduate Institute of Electro-Optical Engineering, National Taiwan University) ;
  • Su, Guo-Dung John (Graduate Institute of Electro-Optical Engineering, National Taiwan University)
  • Received : 2007.05.15
  • Published : 2007.12.31
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Abstract

A low-stress organic polymer membrane is proposed as a deformable mirror that can be incorporated into a cellular phone camera to achieve auto focusing without motor-type moving parts. It is demonstrated that our fabricated device has an optical power of 20 diopters and can switch focus in 14 ms. The surface roughness of the organic membrane is measured around 15 nm, less than ${\lambda}$/20 of the visible light. With curve fitting, we found that the actuated membrane is almost parabolic in shape, which leads to less aberration than spherical surfaces. It is suitable for reflective-optics systems.

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