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Related Experiment Video

Updated: Aug 25, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Optical bi-stability in cubic silicon carbide microring resonators.

Keith Powell, Jianfu Wang, Amirhassan Shams-Ansari

    Optics Express
    |October 15, 2022
    PubMed
    Summary

    We measured the photothermal nonlinear response in cubic silicon carbide (3C-SiC) microring resonators. Suspended 3C-SiC showed a stronger nonlinear response, indicating potential for high-power optical applications.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Silicon carbide (SiC) is a promising material for photonic devices due to its unique optical and thermal properties.
    • Microring resonators are key components in integrated photonics for wavelength filtering and nonlinear optical signal processing.

    Purpose of the Study:

    • To investigate and compare the photothermal nonlinear response of suspended cubic silicon carbide (3C-SiC) and 3C-SiC-on-insulator (SiCOI) microring resonators.
    • To determine the photothermal nonlinear index for both device types and identify factors influencing their nonlinear behavior.

    Main Methods:

    • Fabrication of suspended 3C-SiC and SiCOI microring resonators.
    • Measurement of photothermal nonlinear response, including bi-stability and thermo-optic hysteresis.
    • Analysis of cavity absorption and temperature effects.
    • Modeling using coupled mode theory.

    Main Results:

    • Both suspended 3C-SiC and SiCOI resonators exhibited bi-stability and thermo-optic hysteresis.
    • Suspended 3C-SiC resonators showed a significantly stronger photothermal nonlinear response (index of 4.02×10-15 m2/W) compared to SiCOI resonators (4.32×10-16 m2/W).
    • Differences in nonlinear response were attributed to variations in waveguide absorption, likely due to crystal defect density.

    Conclusions:

    • Suspended 3C-SiC microring resonators possess a superior photothermal nonlinear response compared to SiCOI.
    • The nonlinear optical properties of these resonators can be tuned by engineering waveguide absorption and material quality.
    • These findings suggest potential for developing advanced nonlinear photonic devices using 3C-SiC for high-power applications.