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Related Experiment Video

Updated: Dec 27, 2025

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Contra-directional switching enabled by Si-GST grating.

Hao Hu, Hanyu Zhang, Linjie Zhou

    Optics Express
    |March 4, 2020
    PubMed
    Summary

    We demonstrated a novel optical switch using a silicon-GST grating coupler. This phase-change material enables nonvolatile, low-loss optical switching with a high extinction ratio, marking a first in GST-enabled grating coupler technology.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Nanotechnology

    Background:

    • Optical switching is crucial for telecommunications and data processing.
    • Phase-change materials (PCMs) offer unique optical properties for tunable devices.
    • Existing optical switches often require static power or have limited tunability.

    Purpose of the Study:

    • To design, simulate, and experimentally demonstrate a novel grating-assisted contra-directional coupler for optical switching.
    • To leverage the phase-change properties of Germanium-Antimony-Tellurium (GST) for tunable optical devices.
    • To achieve efficient and nonvolatile optical switching using a silicon-based platform.

    Main Methods:

    • Design of a silicon waveguide with integrated GST.
    • Simulation of the device's optical response and phase-matching conditions.
    • Experimental fabrication and characterization of the grating-assisted contra-directional coupler.
    • Utilizing the amorphous and crystalline states of GST to tune the effective refractive index and propagation constant.

    Main Results:

    • Experimental demonstration of a GST-enabled grating coupler.
    • Insertion loss below 5 dB.
    • Extinction ratio exceeding 15 dB.
    • Operation bandwidth of 2.2 nm around 1576 nm.
    • Nonvolatile switching with no static power consumption.

    Conclusions:

    • The developed Si-GST grating coupler is the first GST-enabled device for phase-change-material-switched optical applications.
    • The device exhibits excellent performance metrics, including low loss and high extinction ratio.
    • The nonvolatile nature of GST makes it an attractive material for energy-efficient optical switches.