A nanoimprint system with 1-lm alignment accuracy (NM-
0606SQ: Meisyo Kiko Co., Japan) was used. The UV-curable resin
was irradiated with UV light and the mold was separated from
the UV-curable resin/Si wafer. To make the second UV nanoimprint,
the UV-curable resin pattern should have sufficient stiffness
and robustness because the first imprinted pattern must persist
after the demolding process.