Multilayer 500 Gbyte Optical Disk

Mitsumori, Ayumi; Higuchi, Takanobu; Yanagisawa, Takuma; Ogasawara, Masakazu; Tanaka, Satoru; Iida, Takuya

doi:10.1143/jjap.48.03a055

Cited by 42 publications

(33 citation statements)

References 15 publications

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“…The calculated reflectivity for several numbers of layers is summarized in Table 1. These values are consistent with the previous reports of multi-layer discs [1][2][3][4][5][6][7].…”

Section: Methodssupporting

confidence: 93%

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Demonstration of readout-signal quality improvement by homodyne detection

et al. 2009

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We experimentally demonstrated improvement in optical disc readout signal quality by homodyne detection. We introduced an optical phase servo system as an alternative to the phase-diversity detection scheme for stabilization of the interference signal in homodyne detection, which resulted in further enhancement of readout signal quality. Experimental results indicate that at least a 16-layer recordable disc can be reliably read out with a jitter of less than 8% at a 1-mW read power by homodyne detection. The estimated amplification of signal amplitude was 13 times.

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“…The calculated reflectivity for several numbers of layers is summarized in Table 1. These values are consistent with the previous reports of multi-layer discs [1][2][3][4][5][6][7].…”

Section: Methodssupporting

confidence: 93%

“…Currently, write-once discs with up to six layers (200 Gbytes) and read-only memory (ROM) discs up to twenty-layers (500 Gbytes) have been demonstrated [1][2][3][4][5][6][7]. However, multilayer recording suffers from a serious decrease in signal level, which causes an insufficient signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

Demonstration of readout-signal quality improvement by homodyne detection

et al. 2009

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“…Optical data storage (ODS) is the best candidate for high‐capacity long‐term storage, as the recording medium can be chosen to ensure data longevity well past 100 years without maintenance . Significant development has gone into methods to increase the storage capacity within traditional optical storage media, including by increasing the number of storage layers in ODS media . However in many‐layered media, the readout laser experiences significant extinction on transit through the layers, due to their absorptive and reflective nature .…”

Section: Introductionmentioning

confidence: 99%

Angular Photothermal Depletion of Randomly Oriented Gold Nanorods for Polarization‐Controlled Multilayered Optical Storage

Taylor

Chon

2015

Advanced Optical Materials

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Increasing the number of layers used in optical data storage media is a promising technique to address increasing capacity demands. However, heavy optical losses are experienced by light on transit through multilayered optical recording media, requiring prohibitively high readout powers for deep layers. Here, gold nanorods are used as the optical data storage medium, and the polarization response of their surface plasmon resonance is exploited to control the optical extinction imposed by the nanorods. A polarization response is imposed onto the initially randomly oriented nanorod films by photothermal depletion technique. The influence of increasing the depletion fluence on the polarization response of nanorod films is investigated. This technique is extended into multilayer films, imposing alignment through 12‐layer nanorod films. Successful optical patterning is carried out on each of the layers following depletion, with a 20× decrease observed in the readout power required to resolve a pattern from layer 12. The proposed angular depletion method will be highly beneficial in reducing optical losses multilayered optical storage applications, enabling storage capacities to be efficiently increased, as well as applications using a continuous medium with high concentrations of plasmonic nanoparticles, where optical losses are significant.

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“…15,16) If the NFR media can realize 250-Mbpsclass high-speed recording and two-or three-layer recording, the SHV optical media, which has more than two hours recording ability would be able to be realized. Studies [19][20][21][22][23] on the maximum of sixteen-multilayer recording using farfield optical recording of the Blu-ray format have led to a data capacity of 2 TBytes the NFR system has a feasibility of the data capacity of 2 TBytes. Thin optical disks that have a thickness of about 0.1 mm can rotate at high speed, [24][25][26] and have demonstrated high-data transfer rate recording.…”

Section: Introductionmentioning

confidence: 99%

Recording characteristics of high-density thin optical disk using near-field optical recording

Koide

Kajiyama

Sato

et al. 2014

OPT REV

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We report on the recording characteristics of a near-field optical recording thin optical disk (NFR-TOD). We proposed a new cooling-less-type write strategy for recording, applied it to the NFR-TOD experimental system, and also applied a partial response maximum likelihood (PRML) signal processing, which was evaluated and optimized the PR coefficient for playback signals of the prototype NFR-TOD. The NFR-TOD has a track pitch of 160 nm and improved recording characteristics. The experimental results of the prototype NFR-TOD and the system indicate sufficiently low bit error rates (bERs) for recorded data at a fourfold higher recording density than the current Blu-ray disk.

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Multilayer 500 Gbyte Optical Disk

Cited by 42 publications

References 15 publications

Demonstration of readout-signal quality improvement by homodyne detection

Demonstration of readout-signal quality improvement by homodyne detection

Angular Photothermal Depletion of Randomly Oriented Gold Nanorods for Polarization‐Controlled Multilayered Optical Storage

Recording characteristics of high-density thin optical disk using near-field optical recording

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