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Related Experiment Video

Updated: Jan 20, 2026

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Using Micromachined Molds, Partial-curing PDMS Bonding Technique, and Multiple Casting to Create Hybrid Microfluidic

Pin-Chuan Chen1, Ren-Hao Zhang2, Liang-Ta Chen2

  • 1Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan. Pcchen@mail.ntust.edu.tw.

Micromachines
|September 1, 2019
PubMed
Summary

This study details a revised manufacturing process for high-density microlens arrays (MLAs). The improved method enables fabrication of denser MLA designs with enhanced uniformity and bonding strength.

Keywords:
microfluidicsmicrolens arraymicromilled microfluidic devices

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Microfabrication

Background:

  • Previous work established a method for creating 6x6 and 8x8 microlens arrays (MLAs).
  • The need for higher density MLAs in optical systems drove the revision of the manufacturing process.

Purpose of the Study:

  • To present a revised manufacturing scheme for fabricating high-density MLAs.
  • To address challenges in achieving uniform membrane thickness and preventing substrate leakage.
  • To demonstrate the capability of the new process in producing dense and uniform MLA.

Main Methods:

  • Micromachining of molds for precise feature replication.
  • Utilizing partial-curing polydimethylsiloxane (PDMS) bonding for substrate fusion.
  • Implementing a multi-step casting process for MLA fabrication.

Main Results:

  • Successfully fabricated 15x15 MLAs (0.5 mm lens diameter, 47.94% fill factor) and 29x29 MLAs (0.25 mm lens diameter, 40.87% fill factor).
  • Demonstrated effective PDMS-glass bonding with a maximum strength of approximately six bars.
  • Achieved high uniformity in PDMS membrane thickness (CV <0.07) and microlens height (CV <0.15).

Conclusions:

  • The revised manufacturing process significantly enhances MLA density capabilities.
  • The partial-curing PDMS bonding is effective for robust substrate adhesion.
  • The process yields high-quality, uniform microlenses suitable for advanced optical applications.