Premastered Optical Disk By Superresolution

Yasuda,; Ono,; Fukumoto,; Kaneko,

doi:10.1109/omods.1993.696723

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…A power-meter has been used to determine the total power released at the position of the sample. The reflectivity R has been directly measured by a spectrophotometer, whereas the absorption coefficient α has been calculated taking into account multiple reflections at the various interfaces of the multilayer stack on the basis of the refractive indices reported in refs 46, 47, 48. The specific heat, the density and the thermal conductivity of the different materials, as function of temperature, have been extracted from refs 43, 49, 50, 51.…”

Section: Methodsmentioning

confidence: 99%

Measurement of crystal growth velocity in a melt-quenched phase-change material

et al. 2013

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Phase-change materials are the basis for next-generation memory devices and reconfigurable electronics, but fundamental understanding of the unconventional kinetics of their phase transitions has been hindered by challenges in the experimental quantification. Here we obtain deeper understanding based on the temperature dependence of the crystal growth velocity of the phase-change material AgInSbTe, as derived from laser-based time-resolved reflectivity measurements. We observe a strict Arrhenius behaviour for the growth velocity over eight orders of magnitude (from ~10 nm s−1 to ~1 m s−1). This can be attributed to the formation of a glass at elevated temperatures because of rapid quenching of the melt. Further, the temperature dependence of the viscosity is derived, which reveals that the supercooled liquid phase must have an extremely high fragility (>100). Finally, the new experimental evidence leads to an interpretation, which comprehensively explains existing data from various different experiments reported in literature.

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Section: Methodsmentioning

confidence: 99%

Measurement of crystal growth velocity in a melt-quenched phase-change material

et al. 2013

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“…Although the readout mechanism of super-RENS is not fully understood at the moment, it is expected that formation of a liquid-state or NTLS inside the laser spot is important to form either an optical aperture [11] or a boundary between it and the surrounding crystalline area [12] to achieve the super-resolution readout. GeN y interface layers used in a super-RENS disc was really effective to enhance the super-resolution readout durability probably since it also suppressed some of the reactions between Sb 75 Te 25 and ZnS-SiO 2 as is similar to the overwriting cyclability of the phase-change recording.…”

Section: Super-resolution Readout Durability Of 97-nm (2t) and 340-nmmentioning

confidence: 99%

Readout durability improvement of super-resolution near-field structure disc using germanium nitride interface layers

et al. 2007

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Inserting germanium nitride thin films between Sb-Te (for super-resolution readout) and ZnS-SiO 2 layers was effective to improve super-resolution readout durability of a super-RENS disc using a PtO x -SiO 2 write-once recording layer. Waveform of 97-nm (that is below the resolution limit of the optics used) and 340-nm combined marks scarcely changed even after 50,000 times readout. CNR of 100 nm marks was stable (within 3 dB decrease) after 268,000 times readout.

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“…6. A high carrier to noise ratio (CNR) of 50 dB is obtained at a pit length of 0.3 µm using a convential compact disk (CD) player (the diffraction limit of CD system is 780/(4×0.5)=390nm) 4 . The superresolution readout results from a high contrast ratio of reflectance in the light spot between highly reflective crystal region and lowly reflective melted region.…”

Section: Chalcogenide Thin Films For Optical Super-resolutionmentioning

confidence: 99%

“…A typical application of super-resolution thin films is in the self-masking super-resolution optical disk. This technique (also called iris eclipse readout technique), that had been originally proposed for magneto-optical disks, was applied to optical disks by K. Yasuda et al 4 . The disk differs from the existing read-only optical disk in the addition of a phase-change material (Ge 2 Sb 2 Te 5 ) mask thin film.…”

Section: Introductionmentioning

confidence: 99%

Optical super-resolution thin films: materials and applications

2005

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To break through the diffraction limit by optical super-resolution thin films is very attractive for the applications in optical and photonic devices. Large optical nonlinearities, such as optic-thermal nonlinearity and the third order optical nonlinearity, of optical thin film materials are very critical to super resolution optical storage, imaging, lithography, and the enhancement of the throughput of the optical near-field nano-aperture. The super-resolution effect in optical thin films or film structures under laser irradiation is focused in this paper. And its applications, especially in super high density optical storage are analyzed and discussed.

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Premastered Optical Disk By Superresolution

Cited by 5 publications

References 2 publications

Measurement of crystal growth velocity in a melt-quenched phase-change material

Measurement of crystal growth velocity in a melt-quenched phase-change material

Readout durability improvement of super-resolution near-field structure disc using germanium nitride interface layers

Optical super-resolution thin films: materials and applications

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