Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4869575
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Funding
- Advanced Optics in Engineering Programme from the Agency for Science, Technology and Research (A*STAR) of Singapore [122-360-0009]
- UK Engineering and Physical Sciences Research Council [EP/F040644/1, EP/G060363/1]
- Royal Society of London
- Agency for Science, Technology and Research, Singapore
- University of Southampton Enterprise Fund
- Engineering and Physical Sciences Research Council [EP/G060363/1] Funding Source: researchfish
- EPSRC [EP/G060363/1] Funding Source: UKRI
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We demonstrate high-density, multi-level crystallization of a Ge2Sb2Te5 thin film using tightly focused femtosecond laser pulses. The submicron spots with 8 distinct data storage states are written on a 1.08 mu m square grid. The significant change in reflectivity of every specific state of crystallized spot allows easy optical reading and identification. As a demonstration, two gray-scale images are written into the storage medium. Our results open up potential applications in ultra-fast two-dimensional parallel cognitive computing and holography. (C) 2014 AIP Publishing LLC.
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