Yutaka Kurose

THERMAL AND OPTICAL PROPERTIES OF METAL AZO DYES FOR DIGITAL VIDEO DISC-RECORDABLE DISCS

The effects of the optical and thermal properties of metal azo dyes on the recording characteristics of digital video disc-recordable (DVD-R) discs have been studied. A sharp threshold for thermal decomposition of the dye assures a clear mark edge and low jitter for the minimum mark length of 0.4–0.44 µm. A steep absorption edge at the 635 nm side is also critical to high reflectivity and for fabricating clear mark edges. Following these guidelines, excellent 0.4 µm shortest mark length recording characteristics are achieved with original metal azo dye.

Organic Dye 25 GB Write-Once Disk with In-Groove Structure

We have developed a new write-once disk technology, which is applicable to the Blu-ray disc system. An organic dye was adopted for the recording layer, which was optimized for the recording of the laser diode wavelength of 405 nm. We adopted a concave in-groove for the recording tracks to avoid thermal interference with adjacent recording tracks due to undesired and uneven dye pooling between adjacent tracks, considering the advantage of fabrication by spin-coating. We optimized the in-groove structure for low-to-high modulated recording. A sample disk, which was made by the conventional spin-coat process, showed good recording and readout characteristics with remarkably low cross-talk and cross-writing.

High-Speed Recording Performance of Metal Azo Dye Containing Digital Video Disc-Recordable Discs

We have studied the high-speed performance at speeds of 3.5 m/s–14.0 m/s of digital video disc recordable (DVD-R) discs which contain metal azo dyes. Good recording sensitivity and good mark jitter with carrier-to-noise ratio (C/N) > 50 dB at mark lengths of less than 0.40 µm were demonstrated at over 10 m/s due to the high recording responses of the dyes. Furthermore, by introducing the write strategy with pulse trains, the sensitivity difference between mark lengths could be completely eliminated and excellent recording with a jitter value of 8% level has been achieved at 7.0 m/s with a minimum mark length of around 0.4 µm.

Recordable Digital Versatile Disc for High Data Transfer Rate Recording

We studied the characteristics of the 4.7 GB recordable digital versatile disc (DVD-R) for a high data transfer rate higher than 44 Mbps. Using simulation, analytical pulse sequence and atomic force microscopy (AFM) measurement, we analyzed the thermal interference. We also used originally synthesized dye with low thermal interference and realized good recording characteristics with jitter values of around 8% at 66 Mbps recording and 11% at 89 Mbps recording.

New Write-One Optical Media Using Near Infrared Absorbing Metal Complex Dyes with Indoaniline-Type Ligand

Abstract New optical media have enough recording performance to be used as write once optical media: moreover these film show good light stability.

4X Speed Recording HD DVD-Recordable Media Using Dye Material

The optical disc for blue laser system using dye material is introduced. High PRSNR and low SbER value are obtained at 4X(26.44m/sec) recording.