Near-Field Optical Recording Using Solid Immersion Lens for High-Density Flexible Optical Disks

作者：Koide Daiichi^*; Kajiyama Takeshi; Sato Ryuji; Tokumaru Haruki; Takano Yoshimichi; Ohishi Kiyoshi

来源：Japanese Journal of Applied Physics, 2013, 52(9): 09LG01.

DOI：10.7567/JJAP.52.09LG01

We propose a near-field optical recording flexible optical disk (NFR-FOD) for high-density recording at a high data transfer rate. We built a prototype high-density NFR-FOD that had a track pitch of 0.16 mu m and we stacked some recording layers on a thin substrate that was 0.1 mm thick. We rotated the NFR-FOD closing the mechanical stabilizer on a drive system with less than 10 mu m(p-p) axial run-out and achieved precise gap servo operation at a high rotational speed. We demonstrated near-field optical recording with a solid immersion lens with a numerical aperture (NA) of 1.84 on the NFR-FOD. The NFR-FOD has a fourfold higher recording density than the current Blu-ray disc, corresponding to a capacity of 100 Gbytes per layer, and a high data transfer rate of 250 Mbps, while rotating at half the speed.

• 出版日期2013-9