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Published on: June 17, 2017
MEMS 3D Scan Mirror with SU-8 Membrane and Flexures for High NA Microscopy
Tianbo Liu1,2,3,4, Aaron J Svidunovich1,2,3,4, Benjamin C Wollant1,2,3,4
1Department of Electrical and Computer Engineering, Montana State University, Bozeman, MT 59717 USA (tianbo.liu@msu.montana.edu).
Abstract:
We demonstrate a MEMS beam scanner capable of biaxial scanning with simultaneous focus control, for integration into a handheld confocal microscope for skin imaging. The device is based on a dual axis gimbal structure with an integrated largestroke deformable mirror. SU-8 polymer is used to construct both the deformable membrane as well as the torsional hinges for biaxial scanning. The 4 mm diameter mirror can perform raster pattern scanning with a range of +/- 1.5 degrees and Lissajous scanning with a range of +/- 3 degrees (mechanical scan angle), and has a maximum deflection of 9 um for focus control. The design, fabrication and characterization of the opto-mechanical performance of the MEMS device are presented in this paper.
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