Chinese Optics Letters, 2004, 2 (6): 06356, Published Online: Jun. 6, 2006  

Land/groove optical recording with GeTe/Sb2Te3 superlattice-like structure

Author Affiliations
1 School of Electronics Information, Wuhan University, Wuhan 430072
2 Data Storage Institute, Singapore, DSI Building, 5 Engineering Drive 1, Singapore 117608
3 1School of Electronics Information, Wuhan University, Wuhan 430072
4 2Data Storage Institute, Singapore, DSI Building, 5 Engineering Drive 1, Singapore 117608
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.

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