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Efficiently poled electro-optic polymer modulators.

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    A novel titanium dioxide (TiO2) / electro-optic (EO) polymer hybrid waveguide modulator achieves high poling efficiency and an enhanced EO coefficient. This device demonstrates excellent temporal stability, making it suitable for advanced optical applications.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Photonics

    Background:

    • Electro-optic (EO) modulators are crucial components in optical communication and signal processing.
    • Achieving high poling efficiency and stable performance in EO polymer devices remains a challenge.

    Purpose of the Study:

    • To design and fabricate a hybrid waveguide modulator utilizing titanium dioxide (TiO2) and an electro-optic (EO) polymer.
    • To investigate the in-device electro-optic coefficient and temporal stability of the hybrid modulator.

    Main Methods:

    • Fabrication of a TiO2/EO polymer hybrid waveguide modulator.
    • Measurement of the in-device electro-optic (EO) coefficient.
    • Evaluation of the VπL figure of merit at 1550 nm.
    • Temporal stability testing at elevated temperatures (85°C).
    • Measurement of waveguide propagation loss.

    Main Results:

    • The hybrid modulator exhibited a high in-device EO coefficient of 100 pm/V, a 32% improvement over thin films.
    • A VπL figure of merit of 3.5 V·cm was achieved at 1550 nm.
    • The device showed excellent temporal stability, with only an 8% change in Vπ over 500 hours at 85°C.
    • Propagation loss in the waveguide was measured at approximately 3 dB/cm.

    Conclusions:

    • The TiO2/EO polymer hybrid waveguide modulator offers significant advantages in achieving high poling efficiency.
    • The demonstrated performance, including enhanced EO coefficient and temporal stability, highlights its potential for practical optoelectronic applications.
    • Further optimization, such as in a push-pull Mach-Zehnder interferometer structure, could lead to even lower VπL values.