Nanoscale line segment fabrication using super-resolution near-field photolithography

Area of Science:

• Nanotechnology
• Photolithography
• Optical Engineering

Background:

• Achieving sub-wavelength resolution in photolithography is crucial for advanced microfabrication.
• Near-field photolithography (NFP) offers potential for high-resolution patterning.
• Thermal effects can be leveraged to enhance resolution in photolithographic processes.

Purpose of the Study:

• To propose and analyze a method combining NFP with thermally induced super-resolution for nanoscale line segment fabrication.
• To investigate the impact of indium film coating on line segment width and profile.
• To develop a simulation model for predicting fabrication outcomes.

Main Methods:

• Developed a theoretical model for optical metal film (indium) transmittance.
• Employed a theoretical heat transfer model to analyze photoresist exposure power density.
• Utilized a simulation combining exposure energy density, exposure, and developmental models with finite node discretization of photoresist.

Main Results:

• Simulated nanoscale line segment fabrication using super-resolution NFP.
• Derived theoretical line segment widths of 88 nm with indium coating and 130 nm without.
• Quantified a 32% reduction in line segment width attributable to the indium film.

Conclusions:

• The proposed method effectively enhances resolution in NFP through thermal super-resolution.
• Indium film coating significantly reduces the fabricated line segment width.
• The simulation models provide accurate predictions for nanoscale line segment fabrication.