Study of pattern fabrication model using near-field photolithography

Area of Science:

• Photolithography
• Nanofabrication
• Optical Engineering

Background:

• Near-field photolithography (NFP) is a key technique for micro- and nano-scale fabrication.
• Understanding pattern formation in NFP is crucial for process optimization.
• Energy density accumulation during overlapping exposures is a critical factor.

Purpose of the Study:

• To establish a pattern fabrication model for NFP.
• To analyze the impact of overlapping exposure beams on energy density.
• To determine optimal parameters for achieving pattern flatness.

Main Methods:

• Developed a pattern fabrication model for NFP.
• Proposed a method for analyzing exposure energy density.
• Utilized the Levenberg-Marquardt method for optimization.
• Conducted simulations to validate the model and identify optimal exposure intervals.

Main Results:

• Demonstrated that exposure energy density accumulates with overlapping beams.
• Derived an error function based on simulation results and maximum energy density.
• Identified an optimal exposure interval (S = 1.66ρ(0)) for maximum pattern flatness.
• Validated the simulation results through pattern fabrication and analysis.

Conclusions:

• The established NFP model accurately predicts pattern formation.
• Optimized exposure parameters can significantly improve pattern flatness.
• The findings have direct industrial applications in fabricating micro- and nano-scale channels.