DocumentCode :
3614338
Title :
Monolithic high aspect ratio two-axis optical scanners in SOI
Author :
V. Milanovic;G.A. Matus;T. Cheng;B. Cagdaser
Author_Institution :
Adriatic Res. Inst., Berkeley, CA, USA
fYear :
2003
fDate :
6/25/1905 12:00:00 AM
Firstpage :
255
Lastpage :
258
Abstract :
Fully monolithic silicon optical scanners are demonstrated with large static optical beam deflection in two axes. The main advantage of the scanners is their high frequency of operation for both axes. Namely, the actuators allow static two-axis rotation of a micromirror without the need for gimbals, or specialized isolation technologies. Each device is actuated by four orthogonally-arranged vertical combdrive rotators etched in the device layer of an SOI wafer, which are coupled by mechanical linkages and mechanical rotation transformers. The transformers allow larger static rotations of the micromirror from the combdrive-stroke limited rotation of the actuators, with a magnification of 1.7/spl times/ angle demonstrated. A device with a mirror diameter of 600 /spl mu/m exhibits lowest resonant frequencies of 4.9 kHz and 6.52 kHz for x-axis and y-axis, respectively. The static optical deflection of the x-axis up to 9.6/spl deg/ and of the y-axis up to 7.2/spl deg/, are achieved for <275 Vdc. Another type of device, designed for lower-voltage operation exhibits static optical deflection about the x-axis to 10.8/spl deg/ and about the y-axis to 11.7/spl deg/, for <85 Vdc. In the same device, lowest resonant frequencies were 1.69 kHz for the x-axis and 2.43 kHz for the y-axis.
Keywords :
"Actuators","Micromirrors","Transformers","Resonant frequency","Silicon","Optical beams","Isolation technology","Etching","Couplings","Mirrors"
Publisher :
ieee
Conference_Titel :
Micro Electro Mechanical Systems, 2003. MEMS-03 Kyoto. IEEE The Sixteenth Annual International Conference on
ISSN :
1084-6999
Print_ISBN :
0-7803-7744-3
Type :
conf
DOI :
10.1109/MEMSYS.2003.1189734
Filename :
1189734
Link To Document :
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