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Proceedings Paper

High-yield microfabrication process for biomimetic artificial haircell sensors
Author(s): Junjun Li; Zhifang Fan; Jack Chen; Jun Zou; Chang Liu
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Paper Abstract

We have developed artificial haircell sensors based on an improved plastic deformation magnetic assembly (PDMA) method. The PDMA method is uniquely capable of realizing 3D microstructures in an efficient, IC-compatible manner. We have improved the design of the PDMA structure to significantly increase the yield by eliminating stress concentration. The robustness of the fabricated devices is enhanced using conformal Parylene deposition. The PDMA process uses magnetic force to bend surface micromachiend cantilever beams. If the bending is significant, the beams would enter plastic deformation regime and maintains permanently bent position even after the magnetic field is removed. Previously, the PDMA process is associated with appreciable yield loss during het magnetic assembly. The failure mechanisms is believed to be stress concentration at sharp corners defined by edges of sacrificial layers. In the new design, a structure enhancement feature is added to the surface micromachiend assembly and hence eliminating any sharp features. Haircells sensors are modular sensory units widely found in the biological world. Haircells are responsible for hearing, flow sensing, and for balancing/equilibrium. We are developing artificial haircell sensors using advanced micromachining technology. The artificial haircell sensors have similar physical scale compared with biological ones.

Paper Details

Date Published: 11 July 2002
PDF: 8 pages
Proc. SPIE 4700, Smart Structures and Materials 2002: Smart Electronics, MEMS, and Nanotechnology, (11 July 2002);
Show Author Affiliations
Junjun Li, Univ. of Illinois/Urbana-Champaign (United States)
Zhifang Fan, Univ. of Illinois/Urbana-Champaign (United States)
Jack Chen, Univ. of Illinois/Urbana-Champaign (United States)
Jun Zou, Univ. of Illinois/Urbana-Champaign (United States)
Chang Liu, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 4700:
Smart Structures and Materials 2002: Smart Electronics, MEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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