Development of UV-curable resins suitable for reverse-Tone lithography for au metamaterials using a print-And-imprint method

We developed a UV-curable resin (NL-SU1) suitable for screen printing with laser-drilled polyimide masks and reversetone nanoimprint lithography. The viscosity of the UV-curable resin composed of two bisphenol A-based monomers was adjusted to 11.0 Pas for the screen printing process. It was determined by photo-differential scanning calorimetry that photoinitiator Irgacure 369 was suitable for high methacrylate consumption in UV curing. The UV-curable resin after curing could be used as a top-coated resist layer on another imprinted resist layer because of its sufficient contrast in oxygen reactive ion etching and argon ion milling. We demonstrated a method for reverse-Tone lithography in a printand- imprint method to fabricate 20-nm-Thick and 50-nm-linewide Au split-ring resonator arrays.