Fractional Talbot lithography with extreme ultraviolet light

Area of Science:

• Optics and Photonics
• Nanotechnology
• Materials Science

Background:

• The Fractional Talbot effect allows for the creation of sub-wavelength structures.
• Extreme ultraviolet (EUV) lithography offers high resolution for nanoscale patterning.
• Combining these techniques can push the limits of nanofabrication.

Purpose of the Study:

• To demonstrate Talbot lithography using the fractional Talbot effect with EUV illumination.
• To achieve spatial frequency multiplication for high-resolution nanostructure fabrication.
• To explore applications in plasmonics and photonic devices.

Main Methods:

• Utilizing coherent illumination from a capillary discharge Ne-like Ar extreme ultraviolet laser.
• Employing the fractional Talbot effect with a parent grating.
• Performing Talbot lithography to create nanostructures.

Main Results:

• Demonstrated Talbot lithography with fractional Talbot effect under EUV coherent illumination.
• Achieved spatial frequency multiplications up to 5x.
• Fabricated high-resolution nanostructures with periods smaller than the master mask.

Conclusions:

• Fractional Talbot effect is a viable technique for high-resolution nanostructure fabrication using EUV lithography.
• This method enables the creation of advanced patterns for plasmonic and photonic devices.
• The technique offers significant potential for next-generation nanotechnology manufacturing.