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Sensors and Materials, Volume 36, Number 6(1) (2024)
Copyright(C) MYU K.K.
pp. 2237-2248
S&M3665 Research Paper
Published: June 4, 2024

An Electromagnetically Driven Micromirror with a Large Stroke [PDF]

Chuan-Hui Ou, Nguyen Van Toan, and Takahito Ono

(Received February 21, 2024; Accepted April 19, 2024)

Keywords: electromagnetic force, micromirror, interferometer, microfabrication, large stroke

In this research, a micromirror driven by electromagnetic force is designed and fabricated. The micromirror features a microfabricated L-shaped spring for large deflection and a bulk permanent magnet with a size of 1 × 1 × 1.5 mm3 mounted on the micromirror for generating electromagnetic actuation force. The device has a footprint of approximately 10 mm × 10 mm. The design of the micromirror is based on Castigliano’s theorem, theoretic spring constant evaluation, and finite element analysis, which are applied to estimate the deflection. The fabricated micromirror can be actuated at the resonance frequency in the atmosphere. The piston vibration at a fundamental frequency of 26.6 Hz is desirable for Michelson interferometers. An 830 µm stroke is achieved by applying 1 Vpp at the resonance frequency, and a 4.44° tilting angle is observed. Overall, the large stroke of the fabricated micromirror implies that the electromagnetic micromirror is promising for high-resolution interferometer applications.

Corresponding author: Nguyen Van Toan

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Cite this article
Chuan-Hui Ou, Nguyen Van Toan, and Takahito Ono, An Electromagnetically Driven Micromirror with a Large Stroke, Sens. Mater., Vol. 36, No. 6, 2024, p. 2237-2248.

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