A volumetric optical disk that has multiple transparent films with optical switching layers is used as a recording medium to increase the number of recording layers. In the disk the optical switching layer is adapted to reduce decay of laser energy and increase reading and recording sensitivity. Well-defined marks of ~100-nm depth can be placed precisely on the transparent films by a focused laser beam. Writing and reading of a four-layer recordable disk, fabricated by molding and spin bonding, have been demonstrated experimentally. The volumetric disk can achieve a high recording capacity with conventional optical pickups.
© 2004 Optical Society of America
(160.4330) Materials : Nonlinear optical materials
(210.0210) Optical data storage : Optical data storage
(210.4590) Optical data storage : Optical disks
(210.4810) Optical data storage : Optical storage-recording materials
Fung-Hsu Wu, Han-Ping D. Shieh, Der-Ray Huang, and Tom D. Milster, "Performance of a Write-Once Multilayer Optical Disk That Uses Transparent Recording Material with an Optical Switching Layer," Appl. Opt. 43, 5498-5502 (2004)