Fabrication of electromagnetic micromirror array

YunHo Jang; Yong-Kweon Kim

doi:10.1117/12.442971

28 September 2001 Fabrication of electromagnetic micromirror array

YunHo Jang, Yong-Kweon Kim

Proceedings Volume 4557, Micromachining and Microfabrication Process Technology VII; (2001) https://doi.org/10.1117/12.442971
Event: Micromachining and Microfabrication, 2001, San Francisco, CA, United States

Abstract

This paper describes the design, fabrication and experiments of a micromirror array driven by electromagnetic force for right angle beam reflection to the vertical direction of the substrate. The device was fabricated using aluminum surface micromachining combined with nickel electroplating. The micromirror has couple of torsional springs enough long for 45 degree rotation, which angular deflection is necessary for right angle beam reflection. Also micromirror has a magnetic material for electromagnetic operation, and it has a mechanical stopper for angular deflection control. The main structural material is evaporated aluminum, and magnetic material is electroplated nickel. Thick photoresist is used as a sacrificial layer, and it is removed by oxygen plasma process. Electromagnetic characteristics were measured to find that about 10kA/m magnetic field intensity is needed for 45 degrees angular deflection. 25V to approximately 50V clamping voltage is required for selectively operation between the array within the external magnetic field. The dynamic response measurement was fulfilled using He-Ne laser and position sensitive diode (PSD). The lapsed time to reach 45 degrees is less than 0.5ms. But upward spring bending prevents the stopper from touching the substrate, so some oscillations corresponding to natural response is observed.

Citation Download Citation

YunHo Jang and Yong-Kweon Kim "Fabrication of electromagnetic micromirror array", Proc. SPIE 4557, Micromachining and Microfabrication Process Technology VII, (28 September 2001); https://doi.org/10.1117/12.442971

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KEYWORDS

Mirrors

Micromirrors

Magnetism

Aluminum

Electromagnetism

Nickel

Electroplating

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