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Related Experiment Video

Updated: Jun 22, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Optically tunable silicon photonic crystal microcavities.

Francis C Ndi, Jean Toulouse, Tim Hodson

    Optics Express
    |June 12, 2009
    PubMed
    Summary

    We show how silicon photonic crystals can modulate light at gigahertz speeds using plasma dispersion. Maximizing cavity quality factor (Q) enables low-power operation for these advanced optical modulators.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optoelectronics

    Background:

    • Photonic crystals offer unique light manipulation properties.
    • Microcavities enhance light-matter interactions.
    • Plasma dispersion is a key effect in semiconductor optics.

    Purpose of the Study:

    • To demonstrate gigahertz speed light modulation using silicon photonic crystal microcavities.
    • To explore the role of optically induced plasma dispersion in modulation.
    • To identify conditions for low-power operation.

    Main Methods:

    • Fabrication of silicon photonic crystal microcavity structures.
    • Optical pumping to induce plasma dispersion.
    • Measurement of light modulation characteristics.
    • Analysis of cavity quality factor (Q).

    Main Results:

    • Successful demonstration of light modulation at potentially gigahertz speeds.
    • Optically induced plasma dispersion confirmed as the modulation mechanism.
    • Correlation between high cavity Q and low pump power requirements established.

    Conclusions:

    • Silicon photonic crystal microcavities are viable for high-speed light modulation.
    • Plasma dispersion offers a promising route for optical modulation.
    • Optimizing cavity Q is crucial for energy-efficient photonic devices.

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