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Open AccessArticle

A Large-Size MEMS Scanning Mirror for Speckle Reduction Application

by Fanya Li 1,2,†, Peng Zhou 2, Tingting Wang 1,2, Jiahui He 1,2, Huijun Yu 2 and Wenjiang Shen 2,*
1
The School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
Key Lab of Nanodevices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the 12th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, 9–12 April 2017, Los Angeles, CA, USA.
Academic Editor: Huikai Xie
Micromachines 2017, 8(5), 140; https://doi.org/10.3390/mi8050140
Received: 30 March 2017 / Revised: 24 April 2017 / Accepted: 24 April 2017 / Published: 3 May 2017
(This article belongs to the Special Issue MEMS Mirrors)
Based on microelectronic mechanical system (MEMS) processing, a large-size 2-D scanning mirror (6.5 mm in diameter) driven by electromagnetic force was designed and implemented in this paper. We fabricated the micromirror with a silicon wafer and selectively electroplated Ni film on the back of the mirror. The nickel film was magnetized in the magnetic field produced by external current coils, and created the force to drive the mirror’s angular deflection. This electromagnetically actuated micromirror effectively eliminates the ohmic heat and power loss on the mirror plate, which always occurs in the other types of electromagnetic micromirrors with the coil on the mirror plate. The resonant frequency for the scanning mirror is 674 Hz along the slow axis, and 1870 Hz along the fast axis. Furthermore, the scanning angles could achieve ±4.5° for the slow axis with 13.2 mW power consumption, and ±7.6° for the fast axis with 43.3 mW power consumption. The application of the MEMS mirror to a laser display system effectively reduces the laser speckle. With 2-D scanning of the MEMS mirror, the speckle contrast can be reduced from 18.19% to 4.58%. We demonstrated that the image quality of a laser display system could be greatly improved by the MEMS mirror. View Full-Text
Keywords: microelectronic mechanical system (MEMS); speckle reduction; electromagnetic force; optical scanning microelectronic mechanical system (MEMS); speckle reduction; electromagnetic force; optical scanning
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MDPI and ACS Style

Li, F.; Zhou, P.; Wang, T.; He, J.; Yu, H.; Shen, W. A Large-Size MEMS Scanning Mirror for Speckle Reduction Application . Micromachines 2017, 8, 140.

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