Deep sub-wavelength imaging lithography by a reflective plasmonic slab.

Area of Science:

• Nanotechnology
• Optics
• Materials Science

Background:

• Achieving high-resolution patterning at the nanoscale is crucial for advanced manufacturing.
• Conventional lithography techniques face limitations in resolving features smaller than the wavelength of light.
• Plasmonic structures offer potential for sub-wavelength optical manipulation.

Purpose of the Study:

• To demonstrate deep sub-wavelength imaging lithography using a reflective plasmonic slab.
• To investigate the resolution and fidelity improvements offered by this plasmonic approach.
• To explore the role of near-field optical proximity corrections in enhancing pattern fidelity.

Main Methods:

• Numerical simulations and experimental validation were employed.
• A reflective plasmonic slab was utilized as the core component.
• Imaging of nano characters and dense lines was performed.
• Control experiments without the plasmonic slab were conducted for comparison.
• Numerical simulations explored near-field optical proximity corrections.

Main Results:

• Deep sub-wavelength imaging lithography was achieved with resolutions down to 32 nm half pitch (1/12 wavelength).
• Remarkable improvements in resolution and fidelity of imaged resist patterns were observed, particularly for isolated nanoscale features.
• The reflective plasmonic slab significantly enhanced imaging performance compared to control experiments.
• Numerical simulations indicated that near-field optical proximity corrections further improve imaging fidelity for 2D nano patterns.

Conclusions:

• Reflective plasmonic slabs are effective for deep sub-wavelength imaging lithography.
• This technique offers superior resolution and fidelity for nanoscale patterning.
• Near-field optical proximity corrections are valuable for optimizing 2D nano pattern imaging.