Condition Determination of Ultraviolet Light Exposure for High-throughput Nanoimprinting
A method for determining the optimum condition of ultraviolet (UV) light exposure for high-throughput nanoimprinting was investigated by photo differential scanning calorimetry, atomic force microscopy, and fluorescence microscopy. The consumption of the acrylate moiety caused by radical photopolymerization of a UV-curable resin had a relationship with the square root of light intensity multiplied by the exposure period. Insufficiently cured resin gave round-shaped imprinted patterns and caused adhesion of the resin component to a mold surface owing to pull-out defects on demolding. We demonstrated that fluorescence microscopy was helpful for the optimum exposure condition in high-throughput UV nanoimprinting.