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In-plane mode dynamics of capillary self-alignment.

Gari Arutinov1, Edsger C P Smits, Pierre Albert

  • 1Holst Centre, TNO , High Tech Campus 31, 5656 AE Eindhoven, Netherlands.

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Summary

This study reveals how capillary forces drive self-alignment in micro-dies. The dynamics of translational and rotational modes couple when wetting occurs, providing insights into micro-assembly processes.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Capillary self-alignment is crucial for micro-assembly.
  • Understanding the dynamics of multiple degrees of freedom is essential for precise alignment.

Purpose of the Study:

  • To experimentally investigate the complete in-plane dynamics of capillary self-alignment.
  • To analyze the coupling between translational and rotational modes during self-alignment.

Main Methods:

  • Selective excitation of translational (shift) and rotational (twist) modes in square dies.
  • High-speed optical tracking to monitor alignment trajectories across three in-plane degrees of freedom.
  • Analysis of dynamics under individual and simultaneous mode excitation.

Main Results:

  • The twist mode dynamics qualitatively mirrors the shift modes: transient wetting, acceleration, and oscillations.
  • Shift modes are independent without twist offset.
  • Coupled dynamics emerge with twist offset due to a synchronization mechanism influenced by wetting.

Conclusions:

  • Experimental results provide benchmarks for understanding capillary self-alignment dynamics.
  • Wetting-induced synchronization couples translational and rotational modes.
  • The study elucidates the complex interplay of forces governing micro-die alignment.