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Published on: July 31, 2014
Resonant Varifocal Micromirror with Piezoresistive Focus Sensor
Kenta Nakazawa1, Takashi Sasaki2, Hiromasa Furuta3
1Department of Nanomechanics, Tohoku University, Aramaki-aza Aoba 6-6-01, Aoba-ku, Sendai 980-8579, Japan. k.nakazawa@hane.mech.tohoku.ac.jp.
Abstract:
This paper reports a microelectromechanical systems (MEMS) resonant varifocal mirror integrated with piezoresistive focus sensor. The varifocal mirror is driven electrostatically at a resonant frequency of a mirror plate to obtain the wide scanning range of a focal length. A piezoresistor is used to monitor the focal length of the varifocal mirror. The device is made of a silicon-on-insulator (SOI) wafer and a glass wafer. A mirror plate and a counter electrode are fabricated by a top silicon layer of the SOI wafer and on the glass wafer, respectively. The piezoresistor is fabricated by ion implantation on a supporting beam of the mirror plate. The stress variation of the beam, which is detected by the piezoresistor, correspond the focal length of the varifocal mirror. The focus length varies from -41 to 35 mm at the resonant frequency of 9.5 kHz. The focal length of the varifocal mirror is monitored by the piezoresistor in real time.
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