In this paper, a new design of an electrothermal micromirror integrated with piezoresistive sensors is proposed. The micromirror is composed of four electrothermal bimorph actuators and four piezoresistive position sensors. In order to reduce the influence of temperature on piezoresistance, silicon dioxide can be used to thermally isolate the piezoresistive sensors from the silicon substrate. The optimized micromirror has a square mirror plate of 1800 * 1800 μm2 and a footprint of 4040 * 4040 μm2 , leading to a fill factor of 20%. The simulation results show that the optical fields of view of the micromirror are about 7° in the tilt and tip directions and the maximum piston displacement is close to 600 μm. The simulation results also show that the sensitivity and resolution of the piezoresistive sensors under a 3 V bias voltage are 2.88 mV/° and 0.4 μrad for the tip-tilt motion, respectively, and 0.056 mV/μm and 1.2 nm for the piston motion, respectively.
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