193nm Superlens imaging structure for 20nm lithography node

Area of Science:

• Optics and Photonics
• Nanotechnology
• Semiconductor Manufacturing

Background:

• Current lithography limits resolution.
• Subwavelength imaging is crucial for advanced nodes.

Purpose of the Study:

• To demonstrate the theoretical feasibility of 20nm lithography resolution.
• To explore the use of aluminum superlens structures for enhanced resolution.

Main Methods:

• Utilizing a 193nm illumination wavelength.
• Employing an aluminum (Al) superlens with an index matching layer.
• Engineering mask material and superlens structure.
• Incorporating assistant features to suppress side lobes.

Main Results:

• Theoretical feasibility of 20nm lithography resolution demonstrated.
• Enhanced transmissivity of evanescent waves achieved.
• Minimal resolution of approximately lambda/10 realized.
• Depth of focus of several nanometers predicted for 20nm half pitch structures.
• Successful suppression of side lobes and resolution of a 20nm two-slit structure.

Conclusions:

• Aluminum superlens structures with index matching layers offer a viable path to 20nm lithography.
• Evanescent wave manipulation is key to overcoming diffraction limits.
• This approach holds potential for next-generation semiconductor fabrication.