Super-resolution photolithography using dielectric photonic crystal

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Plasmonic photolithography offers super-resolution patterning but suffers from high metal losses, limiting practical applications.
• Dielectric photonic crystals (PCs) are explored as an alternative for overcoming these limitations.

Purpose of the Study:

• To propose and analyze a novel photolithography method utilizing a dielectric photonic crystal (PC) structure.
• To demonstrate the capability of PCs in enabling super-resolution lithography by efficiently transmitting high-k waves.

Main Methods:

• Systematic analysis of nanofilms within a dielectric photonic crystal (PC) structure.
• Demonstration of a PC composed of a stacked nine-film multilayer.
• Fabrication of nanopatterns in a photoresist layer using the PC system.

Main Results:

• The dielectric PC efficiently transmits high-k waves, crucial for deep subwavelength patterning.
• Nanopatterns with a 60 nm period were successfully formed in the photoresist.
• The PC-based lithography system exhibits tolerance to surface roughness in multilayer structures.

Conclusions:

• The proposed dielectric PC-based design is a viable approach for super-resolution lithography.
• This method facilitates the production of periodic patterns with high field intensity, aspect ratios, and uniformity.
• The dielectric PC approach offers a promising alternative to plasmonic methods for advanced lithography.