BD-Type Write-Once Disk with Pollutant-Free Material and Starch Substrate

Abstract

The irreducible Hamiltonian BRST symmetry for p-form gauge theories with Stueckelberg coupling is derived. The cornerstone of our approach is represented by the construction of an irreducible theory that is equivalent from the point of view of the BRST formalism with the original system. The equivalence makes permissible the substitution of the BRST quantization of the reducible model by that of the irreducible theory. Our procedure maintains the Lorentz covariance of the irreducible path integral.

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

“…If necessary, a more ecologically benign material than conventional polycarbonate can be used as the substrate. 4) A reflective layer made of silver alloy was first formed by sputtering. Afterwards, an organic dye layer approximately 30 nm thick was formed by spin-coating.…”

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.…”

Low-Noise and Low-Environmental-Impact Reflective Material for High-Density Optical Data Storage

“…We earlier reported a writeonce disk without materials specified in the pollutant release and transfer register (PRTR) law for the BD format. 1) Moreover, to realize sub-Tbyte or Tbyte optical data storage, various candidate technologies, such as volume holographic memory, [2][3][4] microhologram memory, 5,6) near-field memory, 7) super-resolution near-field structure (Super-RENS), 8) two-photon memory [9][10][11][12] and others, 13) are being developed. In particular, in the case of an approach that has achieved a large capacity by downsizing the mark profile, for example, near-field memory and the Super-RENS, the decreasing of disk noise is one of the key problems.…”