Browsing by Author "Wang, Jen-Long"

Now showing 1 - 2 of 2

Microstructure and recording mechanism of Bi-Fe-(N) layer for high-density write-once optical disk
(2008-01-14)
Mai, Hung-Chuan
;
Hsieh, Tsung-Eong
;
Jeng, Shiang-Yao
;
Chen, Chong-Ming
;
Wang, Jen-Long
Bi-Fe-(N) thin film as the recording layer of high density digital versatile disk recordable optical disk was developed. For the disk sample with optimized layer structure, maximum partial response signal to noise ratio of 21.1 and minimum simulated bit error rate of 5x10(-7) were achieved at the write power=5.7 mW. Transmission electron microscopy characterization illustrated that the separation of Bi and Fe elements to form the coarse granular structure in the mark regime during laser irradiation comprised of the recording mechanism. (c) 2008 American Institute of Physics.
Study of Al-Ti/Si bi-layer as the recording media for write-once HD-DVD optical disks
(2009-02-15)
Mai, Hung-Chuan
;
Hsieh, Tsung-Eong
;
Jeng, Shiang-Yao
;
Chen, Chong-Ming
;
Wang, Jen-Long
Optimum structure for HD-DVD optical disks containing Al-Ti/Si bi-layer recording system was identified by reflectivity simulation and dynamic test of disk samples. For the disk sample with optimized structure, the maximum partial response signal-to-noise ratio (PRSNR) of 19.1 dB, minimum simulated bit error rate (sbER) of 1.7 X 10(-7) and modulation >0.6 were achieved at the writing power (P(W)) = 11.2 mW. Transmission electron microscopy (TEM) revealed that the polycrystalline granular clusters constitute the recording marks. Subsequent analyses evidenced that element mixing/alloy reactions occur in between Si and Al-Ti layers and the formation of Al(3.21)Si(0.47) crystalline phase is responsible for the signal recording in the disk samples. (C) 2008 Elsevier B.V. All rights reserved.