A Study of Material Selection for Super-Resolution Readout of Optical Disk with PtO_x Recording Layer

Abstract

Zn33Sb67, Ge20Te80, and Au5Te95 (in at. %) are used in a super-resolution readout optical disk combined with a PtOx recording layer. A high carrier-to-noise ratio (CNR) (40–42 dB) was obtained at a 200 nm mark length, which is smaller than the resolution limit of the optics (265 nm) used. The compositions of the above materials are close to a eutectic point of the binary alloy system. The results indicate that it is a key for the material selection to obtain a high CNR in super-resolution readout.

Density functional theory study of platinum oxides: From infinite crystals to nanoscopic particles

“…16 In nanoelectronics, thin films of (amorphous) platinum oxides find application as electrodes for memory capacitors 17,18 and in super-resolution near-field structure disks. 19,20 The versatility of PtO x films lies above all in the possibility of tuning the electronic properties of the films with the film deposition conditions. 21,22 Depending on their structure and composition, platinum oxide films present metallic, semiconducting or insulating behavior, the latter particularly evident in the case of fully oxidized PtO 2 films.…”

Material selection and disc structure optimization studies for super-resolution readout with PtOx recording layer

“…7 The other is that the sputtered film was fairly opaque. 8 These two properties are probably important to increase temperature by laser irradiation, and the temperature increase is suggested to play an important role in the super-resolution readout. 9 Fig.…”

Super-Resolution Optical Disc with Radial Density Increased by Narrowed Track Pitch Corresponding to Diffraction Limit

“…The super-resolution near-field structure (Super-RENS) 1) is one of the promising technologies for increasing recording density. Super-RENS technology has the capability of reading out pits/marks shorter than the diffraction limit determined by =ð4NAÞ, realized by utilizing an optically nonlinear property of a material of an active layer, for instance, compounds of Sb or Te such as Sb-Te, Ge-Sb-Te, Ag-In-Sb-Te, and In-Sb, [2][3][4][5][6][7][8][9][10][11][12][13] where and NA stand for the wavelength of laser light and the numerical aperture of an objective lens, respectively. When a high laser power is injected on the active film, changes in the effective index n and extinction k of the active film are induced by its own optical absorption.…”