High-rate tunable ultrasonic force regulated nanomachining lithography with an atomic force microscope

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Nanolithography is crucial for fabricating nanoscale devices.
• Existing mechanical nanolithography methods often lack speed and precise control.
• Atomic Force Microscope (AFM) based techniques offer high resolution but can be slow.

Purpose of the Study:

• To develop a high-rate, tunable nanomachining technique using AFM.
• To enhance lithographical speed and controllability through controlled vibrations.
• To enable cost-effective fabrication of nanostructures.

Main Methods:

• Utilized ultrasonic z-vibration of the sample to regulate fabrication depth.
• Introduced high-frequency in-plane circular vibration for feature width control and speed enhancement.
• Fabricated features on a PMMA film and transferred patterns to a silicon substrate via reactive ion etching.

Main Results:

• Achieved nanolithography speeds of tens of microns per second, significantly higher than existing methods.
• Successfully fabricated features with dimensions ranging from tens to hundreds of nanometers in a single scan.
• Demonstrated a tunable approach for nanostructure fabrication with controlled depth and width.

Conclusions:

• The developed AFM-based nanomachining technique offers a significant advancement in high-speed, controllable nanolithography.
• This method provides a cost-effective and tunable platform for fabricating complex nanostructures.
• The findings pave the way for more efficient nanoscale manufacturing processes.