Browsing by Author "Dimitrov, D"

Now showing 1 - 2 of 2

Mask films for thermally induced superresolution readout in rewritable phase-change optical disks
(2001-03-01)
Lu, YH
;
Dimitrov, D
;
Liu, JR
;
Hsieh, TE
;
Shieh, HPD
Tellurium was studied as a mask film in a thermally induced superresolution rewritable optical disk for detecting below-diffraction-limit marks. Mark trains of 0.15 mum could be retrieved with 9 dB in carrier-to-noise (CNR) using an optical system with the laser wavelength of 780 nm and an objective lens of 0.55 numerical aperture. Readout cyclability was examined and methods to further improve readout cyclability were proposed.
The influence of oxygen and nitrogen doping on GeSbTe phase-change optical recording media properties
(2004-03-15)
Dimitrov, D
;
Shieh, HPD
;
光電工程學系
;
Department of Photonics
Nitrogen and oxygen doped and co-doped GeSbTe (GST) films for phase-change optical recording are investigated. It is found that the crystallization temperature increased as well as the crystalline microstructure refined by doping. The carrier-to-noise ratio (CNR) and erasability of phase-change optical disks are improved being up to 52 and 35 dB, respectively, by using an appropriate nitrogen doping or co-doping concentration in the recording layer. Optical disks with co-doped recording layer are found to be superior in the recording characteristics then the single doped recording layer disks. (C) 2003 Elsevier B.V. All rights reserved.