Geometrical Variation Analysis of an Electrothermally Driven Polysilicon Microactuator

TL;DR

This paper develops analytical and finite element models to analyze the thermal and mechanical behavior of an electrothermally driven polysilicon microactuator, exploring how geometric variations affect its performance.

Contribution

It introduces a comprehensive analysis of geometric variations on microactuator performance, including an optimal beam length ratio and effects of air gap, validated by comparison with experimental data.

Findings

Optimal beam length ratio of 0.46 for maximum deflection

Increasing air gap enhances tip deflection

Longer hot arms increase sensitivity to geometric variations

Abstract

The analytical models that predict thermal and mechanical responses of microactuator have been developed. These models are based on electro thermal and thermo mechanical analysis of the microbeam. Also, Finite Element Analysis (FEA) is used to evaluate microactuator tip deflection. Analytical and Finite Element results are compared with experimental results in literature and show good agreement in low input voltages. A dimensional variation of beam lengths, beam lengths ratios and gap are introduced in analytical and FEA models to explore microactuator performance. An electrothermally driven polysilicon microactuator similar to Pan's actuator architecture has been studied in this paper. This microactuator generates deflection through asymmetric heating of the hot and cold polysilicon arms with different lengths. For this microactuator architecture, an optimal beam length ratio equal to 0.46 has been obtained to achieve maximum tip deflection. . As it was expected, the results show decreasing air gap increase microactuator tip deflection. It is also found that for microactuators with longer hot arms, microactuator tip deflections are more sensitive to beam length ratios and air gap.