Rewritable multilevel optical data storage in BaFCl nanocrystals

N. Riesen; X. Pan; K. Badek; Y. Ruan; T. Monro; J. Zhao; H. Ebendorff-Heidepriem; H. Riesen

doi:10.1117/12.2322804

14 September 2018 Rewritable multilevel optical data storage in BaFCl nanocrystals

N. Riesen, X. Pan, K. Badek, Y. Ruan, T. Monro, J. Zhao, H. Ebendorff-Heidepriem, H. Riesen

Proceedings Volume 10757, Optical Data Storage 2018: Industrial Optical Devices and Systems; 1075704 (2018) https://doi.org/10.1117/12.2322804
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

In this paper, a novel and efficient approach to digital optical data storage using rare-earth ion doped inorganic insulators is demonstrated. More specifically, the nanocrystalline alkaline earth halide BaFCl:Sm is shown to hold great potential for multilevel optical data storage. Proof-of-concept demonstrations show that these phosphors could be used for rewritable, multilevel optical data storage down to the physical dimensions of a single nanocrystal. Multilevel information storage is based on the highly-efficient and reversible conversion of Sm³⁺ to Sm²⁺ ions upon exposure to UV-C light. The stored information is efficiently read-out by employing the photoluminescence of the Sm ²⁺ ions in the nanocrystals, with the signal strength being dependent on the UV-C intensity used during the write step. This serves as the mechanism for multilevel data storage in the individual nanocrystals. This data storage platform has the potential to be extended to 2D and 3D memory for storage densities that could approach tera- or even petabyte/cm³ levels.

Citation Download Citation

N. Riesen, X. Pan, K. Badek, Y. Ruan, T. Monro, J. Zhao, H. Ebendorff-Heidepriem, and H. Riesen "Rewritable multilevel optical data storage in BaFCl nanocrystals", Proc. SPIE 10757, Optical Data Storage 2018: Industrial Optical Devices and Systems, 1075704 (14 September 2018); https://doi.org/10.1117/12.2322804

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KEYWORDS

Samarium

Luminescence

Nanocrystals

Optical storage

Data storage

Ultraviolet radiation

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