“…Nanostructured ZnO has attracted manifold interest recently for its room‐temperature blue‐UV lasing and wide optoelectronic applications (Cao, Xu, Seelig, et al , 2000; Cao, Xu, Zhang, et al , 2000; Wiersma, 2000; Huang et al , 2001). To pursue ultra‐high density optical recording ability, a promising method that uses a metallic oxide nanostructured thin film as a near‐field optical active layer to promote and enhance signals between adjacent recording marks has been studied in several types of near‐field optical disks with metallic oxide nanostructured thin films (Tsai & Lin, 2000; Tsai et al , 2000; Liu et al , 2001; Yu et al , 2004; Fu et al , 2006). To achieve our purpose of ultra‐high density recording ability, we prepare sputtered ZnO x nanostructured thin film as a near‐field optical active layer to attain ultra‐high density recording.…”