Three-Dimensional Nanolithography with Visible Continuous Wave Laser through Triplet Up-Conversion

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Direct laser writing (DLW) typically uses two-photon polymerization, requiring high laser intensities and expensive femtosecond lasers.
• This limits accessibility and increases fabrication costs for micronanostructures.

Purpose of the Study:

• To develop a low-cost, high-precision direct laser writing method for micronanostructure fabrication.
• To overcome the high laser intensity requirement of traditional two-photon polymerization.

Main Methods:

• Proposed a novel direct laser writing approach based on triplet up-conversion.
• Verified the method's feasibility through dynamic modeling and experimental validation.
• Investigated the relationship between laser intensity, processing speed, and fabricated nanostructure dimensions.

Main Results:

• Achieved low-intensity fabrication of multidimensional nanostructures.
• Demonstrated a minimum line width of approximately 50 nm.
• Optimized fabrication parameters at a laser intensity of 2.5 × 10^5 W/cm^2 and a processing speed of 150 μm/s.

Conclusions:

• The triplet up-conversion based DLW method offers a viable alternative for low-cost, high-precision micronanostructure fabrication.
• This technique enables the creation of complex nanostructures with reduced laser power requirements.
• Presents a new pathway for advanced nanotechnology applications.