Chinese Optics Letters, 2004, 2 (6): 06356, Published Online: Jun. 6, 2006
Land/groove optical recording with GeTe/Sb2Te3 superlattice-like structure
210.0210 optical data storage 210.4590 optical disks 210.4770 optical recording 160.4670 optical materials
Abstract
A superlattice-like (SLL) structure was applied to phase-change optical recording. The recording layer consisting of alternating thin layers of two different phase-change materials, GeTe and Sb2Te3, were grown by magnetron sputtering on polycarbonate substrates. Land/groove optical recording was adopted to suppress crosstalk and obtain a large track density. Dynamic properties of the SLL disc were investigated with the shortest 1T pulse duration of 8 ns. Clear eye pattern was observed after 10000 direct overwrite cycles. Erasability above 20 dB was achieved at a constant linear velocity of 19 m/s. Carrier-noise ratio (CNR) kept above 46 dB when the recording frequency reaches 21 MHz. The SLL phase change optical disc demonstrates a better recording performance than the Ge1Sb2Te4 and Ge1Sb4Te7 discs in terms of CNR, erasability, and overwrite jitter.
Wei Qiang, Luping Shi, Towchong Chong, Yang Cao. Land/groove optical recording with GeTe/Sb2Te3 superlattice-like structure[J]. Chinese Optics Letters, 2004, 2(6): 06356.