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    Solution-processed metallic carbon nanotubes (CNTs) offer efficient thermo-optic tuning for silicon and silicon nitride microring resonators. These CNT heaters outperform conventional metal and graphene options in power efficiency and thermal transient response.

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    Area of Science:

    • Photonics and Nanomaterials
    • Integrated Optics

    Background:

    • Microring resonators are crucial for optical signal processing.
    • Efficient thermo-optic tuning is essential for dynamic control of microring resonators.
    • Conventional heaters face limitations in power efficiency and thermal response.

    Purpose of the Study:

    • To demonstrate novel on-waveguide thermo-optic tuners using solution-processed metallic carbon nanotubes (CNTs).
    • To evaluate the performance of CNT-based heaters on silicon-on-insulator (SOI) and silicon nitride (SiN) microring resonators.
    • To compare the power efficiency and thermal transient of CNT heaters against conventional materials.

    Main Methods:

    • Fabrication of thermo-optic tuners using solution-processed metallic CNTs on SOI and SiN microring resonators.
    • Characterization of device performance around 1550 nm wavelength.
    • Measurement of thermo-optic power efficiency and thermal transient response.

    Main Results:

    • On SOI microring resonators, a power efficiency of 29 mW/FSR and a thermal transient of 1.3 μs were achieved.
    • CNT heaters demonstrated superior power efficiency and faster thermal transient compared to metal and graphene heaters.
    • On SiN microring resonators, localized heating and improved power efficiency were observed with increased CNT coverage.

    Conclusions:

    • Solution-processed metallic CNTs provide a highly efficient and fast thermo-optic tuning solution for microring resonators.
    • CNT-based heaters offer advantages in power efficiency and thermal crosstalk reduction.
    • This technology is promising for advanced integrated photonic devices requiring precise optical control.