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Novel Technique for Backside Alignment Using Direct Laser Writing.

Melissa Mitchell1, Siva Sivaraya1, Simon J Bending2

  • 1Department of Electronic and Electrical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK.

Micromachines
|March 27, 2025
PubMed
Summary

Researchers developed a low-cost backside alignment method for microfabrication using a direct laser writer. This technique accurately aligns masks to micro-electromechanical systems (MEMS) features, overcoming the expense of traditional equipment.

Keywords:
MEMSalignmentmicrofabricationnanofabrication

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Mechanical Engineering

Background:

  • Backside alignment is crucial for microfabrication, particularly in micro-electromechanical systems (MEMS).
  • Standard double-side mask aligners are prohibitively expensive for many research facilities.

Purpose of the Study:

  • To introduce a cost-effective backside alignment method for microfabrication.
  • To enable precise mask alignment using readily available direct laser writers.

Main Methods:

  • Utilized corner co-ordinates of silicon wafer samples as alignment features.
  • Developed a transformation matrix to map design to stage co-ordinates.
  • Validated the method on 100 μm copper features using photolithography.

Main Results:

  • Achieved an average alignment resolution of 23 ± 1 μm (x-direction) and 8 ± 4 μm (y-direction).
  • Attained a rotation misalignment of less than 1 degree.
  • Identified challenges with non-ideal sample corners affecting alignment accuracy.

Conclusions:

  • The direct laser writer method offers a viable low-cost alternative for backside mask alignment.
  • This approach facilitates microfabrication process development in resource-limited settings.
  • Further refinement is needed for samples lacking sharp, well-defined corners.