Three-Dimensional in Situ Electron-Beam Lithography Using Water Ice

Area of Science:

• Nanoscience and Nanotechnology
• Materials Science
• Advanced Manufacturing

Background:

• Three-dimensional (3D) nanofabrication is crucial for developing advanced nanodevices.
• Current methods struggle to balance resolution, accuracy, simplicity, and adaptability.
• Conventional techniques often involve multiple complex steps and contamination risks.

Purpose of the Study:

• To introduce a simplified and contamination-free 3D nanofabrication technique.
• To demonstrate the fabrication of complex 3D nanostructures using electron-beam lithography with ice resists (iEBL).
• To overcome limitations of existing 3D nanofabrication methods.

Main Methods:

• Developed a 3D nanofabrication process utilizing electron-beam lithography with ice resists (iEBL).
• Fabricated 3D nanostructures through stacking layered structures and dose-modulated exposure.
• Performed the entire process within a single vacuum system, eliminating spin-coating and developing steps.

Main Results:

• Achieved a pattern resolution of 20 nm.
• Maintained an alignment error below 100 nm through in situ alignment and correction.
• Demonstrated a contamination-free process with significantly fewer processing steps compared to conventional methods.

Conclusions:

• The proposed iEBL technique offers a simplified, contamination-free approach to 3D nanofabrication.
• This method shows great potential for fabricating complex 3D nanodevices.
• The balance of resolution, accuracy, and simplicity makes iEBL a promising technique for future nanotechnology applications.