SERODS: Principle of a new optical data storage system
© 1994 SPIE. All rights reserved. This paper describes the basic principle of a new approach for large-memory optical disk storage based on the Surface-Enhanced Raman Optical Data Storage (SERODS) technology. With the SERODS technology, the molecular interactions between the optical layer molecules and the substrate are modified by the writing laser, changing their surface-enhanced Raman scattering (SERS) emitting properties, so that they are encoded to store information as bits. Since the SERS-emitting properties are extremely sensitive to molecular microenvironments (enhancement up to a million fold), lower laser energies (shorter pulses and/or faster rate) and much smaller "molecular holes" are required for the writing process. A reading laser with much lower energy than the writing laser, and a photometric detector tuned to the frequency of the Raman emissions, are used to retrieve the stored information. The SERODS technology has great potential to offer several advantages including high storage density, unique spectral features of the encoded signals, three-dimensional storage capability.
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