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Note: Multi-sheet light enables optical interference lithography.

Kavya Mohan1, Ayush Tyagi2, Partha Pratim Mondal1

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Summary
This summary is machine-generated.

A novel spatial filter technique fabricates microfluidic channels using multiple light sheets (MLS). This method allows for precise control over channel geometry, offering a cost-effective solution for large-scale production.

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Area of Science:

  • Microfluidics
  • Photolithography
  • Optical Engineering

Background:

  • Microfluidic devices are crucial for lab-on-a-chip applications.
  • Fabrication of microfluidic channels often requires complex and expensive techniques.
  • Single-shot lithography offers potential for rapid prototyping and mass production.

Purpose of the Study:

  • To develop and demonstrate a modified spatial filter-based single-shot lithography technique.
  • To fabricate an array of microfluidic channels with controlled geometry.
  • To investigate the scalability and cost-effectiveness of the proposed method.

Main Methods:

  • Utilizing a modified spatial filter within a cylindrical lens system to generate a multiple light sheet (MLS) pattern.
  • Illuminating a negative photoresist (DPHPA monomer with rose bengal) with the MLS pattern for single-shot exposure.
  • Analyzing the effect of spatial filter transmission window (α - β angle) on micro-channel geometry.

Main Results:

  • Successfully fabricated an array of 7 microfluidic channels.
  • Achieved precise control over channel width (approx. 5 μm) and inter-channel separation (approx. 12 μm).
  • Demonstrated a near-linear dependence of micro-channel geometry on exposure time.

Conclusions:

  • The modified spatial filter-based single-shot lithography is an effective method for microfluidic channel fabrication.
  • The technique enables selective plane patterning and precise control over micro-channel dimensions.
  • This approach offers a cost-effective solution for large-scale production of microfluidic devices.