Inorganic Write-Once Disc for High Speed Recording

Abstract

The electronic structure of graphite is studied using the generalized tight-binding approximation. We investigate how the energy spectra around the Fermi energy of graphite depend on interlayer stacking arrangement. We find that graphite and bilayer graphene with rotational stacking arrangement are metals with a massless Dirac fermion at the Fermi level, as is the case for isolated graphene sheets. Due to the spatially separated K points on each layer, two pairs of linear dispersion curves cross at the Fermi energy and are expected to exhibit characteristics different from those of graphite with AB stacking. #

Development of low-to-high Blu-ray recordable (BDR) disc

“…For the formation and detection of appropriate record- ing marks, it is necessary to have materials, which can transform either from amorphous to crystalline phase or vice-versa with sufficient difference in reflectivity between these two states when exposed to laser pulses of suitable power. Materials that have been developed over the years for BDR applications are Cu/Si [5,7], SbSnIn, InSb and BiFeO [6]. We have established that inorganic Sb 100−x−y Sn x In y material when doped with certain percentage of ceramics ZnS-SiO 2 , could be used as the suitable material as phase change layer for the development of BDR L2H media.…”

Optical recording characteristics of molybdenum oxide films prepared by pulsed laser deposition method

“…The energy gaps of recording films employed in WODs have become wider as the wavelength of the semiconductor laser to read and write information has become shorter from red (λ = 780-830 nm) to blue (λ~400 nm). A new area of interest is now rapidly developing as Cu-Si bilayers [1][2][3] and Bi-Ge-N alloy layers [4] are replacing dye layers as recording media in writeonce blue-ray disks. Oxide films, however, seem to be one of the most anticipated media [5] because of the following reasons: (1) superior duration under ambient temperatures and humidity conditions, (2) small transition time between different states caused by laser pulse irradiation, (3) a clear-cut edge around the dot formed in the films and (4) no-toxic to the surroundings.…”

Inorganic material for high speed write-once FVD disc

“…Several inorganic types write-once recording materials, such as AgOx [1], Te-O-Pd [2], Si/Cu [3], Ge-Bi-N [4] and Si/Al [5] have been proposed in the prior study on writeonce optical discs. In this paper, germanium aluminium bimetal layers as write-once recording material are applied for high-speed write-once FVD disc.…”