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A Silicon Micromachined f - \theta Microlens Scanner Array by Double-Deck Device Design Technique

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7 Author(s)
Takahashi, K. ; Inst. of Ind. Sci., Univ. of Tokyo ; Ho Nam Kwon ; Mita, M. ; Saruta, K.
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In this paper, we report an array of f- thetas microlens optical scanners developed for 3-D optical cross connect (OXC) system using the bulk-silicon micromachining technique. An electrostatic XY-stage mechanism for the 2-D lens scanner was designed to have a small footprint (2 mmtimes2 mm), compared with an integrated silicon lens (diameter 1 mm) due to the newly developed double-deck actuator design; all the mechanical parts (suspensions and frames) were made in the substrate layer of a silicon-on-insulator (SOI) wafer, and the electrostatic actuation mechanism (electrodes and electrical interconnection) was made in the SOI layer. A silicon lens was integrated on top of the XY-stage by transferring the spherical profile of a thermal-reflow photoresist pattern into the SOI layer by reactive-ion etching. The XY lens scanner was found to operate at lateral displacement of 19 mum in the X-directions and 23 mum in the Y-directions at drive voltages of 110 and 60 V, respectively. For an optical assembly of the OXC, we used additional lenses in a telescope formation to double the beam angle that was steered by the f- thetas microlens scanner by which the lens displacement could be designed to be smaller by a factor of 1/2

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:13 ,  Issue: 2 )