Solid immersion interference lithography with conformable phase mask
We propose a simple and cost-effective method of immersion interference lithography. It allows close contact with the solid coupling medium without index matching liquid. The photoresist is kept free from the contamination of liquid. The solid coupling medium improves the resolution by a factor of its refractive index. We obtained a 58-nm half-pitch grating, which corresponds to a feature size of 0.18?.
immersion interference lithography interference lithography phase mask perfluoropolyether