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Related Experiment Video

Updated: Jun 10, 2026

Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices
10:18

Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices

Published on: January 27, 2017

Diffractive phase-shift lithography photomask operating in proximity printing mode.

Giuseppe A Cirino1, Ronaldo D Mansano, Patrick Verdonck

  • 1CCET, Federal University of Sao Carlos, Rod. Whashington Luis, Km 235 - 13565-905, Sao Carlos, SP, Brazil. gcirino@ufscar.br

Optics Express
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel phase shift proximity printing lithographic mask, achieving 1.5 micrometer linewidth resolution. This advanced mask technology enables finer feature fabrication for MEMS and MOEMS devices.

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Area of Science:

  • Optics and Photonics
  • Nanofabrication
  • Materials Science

Background:

  • Traditional binary masks limit resolution in proximity printing.
  • Micro- and nano-fabrication demands higher resolution lithographic techniques.
  • Holographic principles offer potential for advanced mask design.

Purpose of the Study:

  • To design, manufacture, and test a phase shift proximity printing lithographic mask.
  • To improve resolution beyond the capabilities of conventional binary masks.
  • To explore the application of this technology in micro- and nano-device fabrication.

Main Methods:

  • Design based on Fresnel computer-generated holograms and scalar diffraction theory.
  • Amplitude and phase distributions mapped to discrete levels with a sub-cell coding scheme.
  • Fabrication using a fused silica substrate and amorphous hydrogenated carbon (a:C-H) thin film.
  • Lithographic projection onto a resist-coated silicon wafer at a 50 micrometer distance.

Main Results:

  • Achieved linewidth resolution as fine as 1.5 micrometers.
  • Demonstrated resolution superior to traditional binary masks in proximity printing.
  • Successful imaging using both UV laser and a partially coherent arc lamp light source.

Conclusions:

  • The developed phase shift mask significantly enhances resolution in proximity printing.
  • The mask design and fabrication are suitable for producing micro- and nano-scale features.
  • This technology holds promise for the advancement of MEMS and MOEMS fabrication.