1.7 Gbit/in.2 gray-scale continuous-phase-change femtosecond image storage

1.7 Gbit/in.2 gray-scale continuous-phase-change femtosecond image storage

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 μm square grid. The significant change in reflectivity of every specific state of crystalliz...

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Bibliographic Details
Main Authors: Craig, Chris, Zheludev, Nikolay I., MacDonald, K. F., Wang, Q., Maddock, J., Rogers, E. T. F., Roy, T., Hewak, D. W.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2014
Subjects:
DRNTU::Science::Physics
Online Access:https://hdl.handle.net/10356/103927
http://hdl.handle.net/10220/19381
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Institution: Nanyang Technological University
Language: English
Description
Summary: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 μm 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.

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