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Terahertz multi-level nonvolatile optically rewritable encryption memory based on chalcogenide phase-change

Shoujun Zhang1, Xieyu Chen1, Kuan Liu2

  • 1Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China), Tianjin University, Tianjin 300072, China.

Iscience
|August 23, 2022
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Summary
This summary is machine-generated.

Researchers developed a new terahertz (THz) memory using GST material for fast, efficient data storage and encryption. This optically rewritable device offers high speed and stability for advanced THz communication systems.

Keywords:
Applied sciencesDevicesPhotonics

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Information Technology

Background:

  • Efficient information processing and encryption are critical for future terahertz (THz) communication systems.
  • Nonvolatile memory solutions are needed for high-speed data handling and secure storage.

Purpose of the Study:

  • To demonstrate a multi-level, nonvolatile, optically rewritable memory and encryption device operating in the THz regime.
  • To utilize chalcogenide phase-change materials for advanced THz data storage applications.

Main Methods:

  • Fabrication of a memory unit based on Germanium-Antimony-Tellurium (Ge2Sb2Te5, GST) phase-change material.
  • Optical manipulation of GST states using tunable laser fluence for data writing and erasing.
  • Experimental characterization of memory performance, including speed, reproducibility, and stability.

Main Results:

  • Achieved multi-level intermediate states and centimeter-level amorphization in GST within the THz regime.
  • Demonstrated a high operating speed of up to 4 nanoseconds (ns) with excellent reproducibility and long-term stability.
  • Successfully implemented hexadecimal coding information memories and terahertz photoprint memory, showcasing lithography-free device feasibility.

Conclusions:

  • The developed GST-based THz memory offers a practical solution for secure information storage and processing.
  • This technology paves the way for novel nonvolatile active THz devices and advanced communication systems.