The Principle and Development of Optical Maskless Lithography Based Digital Micromirror Device (DMD).

Area of Science:

• Optics and Photonics
• Microfabrication Technologies
• Digital Systems Engineering

Background:

• Optical lithography is crucial for microchip manufacturing, facing challenges in resolution, accuracy, and speed.
• Digital Micromirror Devices (DMDs) offer a novel approach to mask generation and light manipulation in lithography.

Purpose of the Study:

• To conduct a comprehensive review of Digital Micromirror Device (DMD)-based optical lithography systems.
• To systematically analyze the point-array with oblique-scanning and stepping operation principle.
• To summarize achievements and potential applications in micro-scale fabrication.

Main Methods:

• Systematic analysis of the point-array, oblique-scanning, and stepping operation principles.
• Review of system development aspects: critical dimension (CD) resolution, overlay accuracy, and throughput.
• Evaluation of achievements using the digital virtue mask in various fabrication processes.

Main Results:

• The point-array with oblique-scanning and stepping principle is identified as a core driver for DMD lithography development.
• DMD-based systems demonstrate advancements comparable to conventional lithography in CD resolution, overlay accuracy, and throughput.
• Successful application of DMD lithography in integrated circuit (IC) manufacturing and diverse micro-scale fabrication processes.

Conclusions:

• DMD-based optical lithography presents a viable and advanced alternative to conventional methods.
• The unique characteristics of the digital virtue mask enable high-performance microfabrication.
• The analyzed operational principles are key to the future development and widespread application of this technology.