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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Device-Level Photonic Memories and Logic Applications Using Phase-Change Materials.

Zengguang Cheng1, Carlos Ríos1,2, Nathan Youngblood1

  • 1Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

Researchers developed optical pulse-width modulation (PWM) to control phase-change materials for photonic computing. This technique enables efficient, practical photonic memories and logic devices, paving the way for all-optical computers.

Keywords:
phase-change materialsphotonic computingphotonic logicphotonic memoriespulse-width modulation

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Area of Science:

  • Photonics
  • Materials Science
  • Computer Engineering

Background:

  • Electronic computers face speed and bandwidth limitations, driving research into alternatives like photonic computing.
  • Developing basic computing elements on photonic devices is crucial for realizing all-optical computers.
  • Fiber optics success inspires advancements in high-speed data transmission and computing.

Purpose of the Study:

  • To develop a practical method for optically programming phase-change materials for computing applications.
  • To demonstrate the feasibility of photonic memories and logic devices using optical pulse-width modulation (PWM).
  • To investigate the effectiveness of PWM for energy-efficient and controlled switching of phase-change materials.

Main Methods:

  • Implemented optical pulse-width modulation (PWM) switching of phase-change materials on an integrated waveguide.
  • Utilized low peak power PWM for efficient recrystallization of phase-change materials.
  • Demonstrated multilevel photonic memories with random accessibility and programmable optical logic devices (OR, NAND).

Main Results:

  • Established PWM as an effective, energy-efficient, and controllable method for phase-change material switching.
  • Successfully implemented multilevel photonic memories with complete random accessibility.
  • Achieved optical logic operations (OR, NAND) on a single integrated photonic phase-change cell.

Conclusions:

  • Optical pulse-width modulation (PWM) offers a practical and elegant technique for programming photonic phase-change devices.
  • This approach facilitates the development of essential components for future photonic computing systems.
  • The study demonstrates a significant step towards the realization of all-optical computers.