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Flexible waveguide integrated thermo-optic switch based on TiO2 platform.

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    |June 15, 2023
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    Researchers developed flexible titanium oxide thermo-optic switches (TOSs) for optoelectronics. These novel devices offer significantly reduced power consumption and excellent mechanical stability for wearable systems.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Photonics

    Background:

    • Mechanically flexible photonic devices are essential for bio-integrated systems and wearables.
    • Thermo-optic switches (TOSs) are critical for optical signal control in these systems.

    Purpose of the Study:

    • To demonstrate flexible titanium oxide (TiO2) TOSs using a Mach-Zehnder interferometer (MZI) structure for the first time.
    • To evaluate the performance and stability of these flexible TOSs.

    Main Methods:

    • Fabrication of flexible TiO2 TOSs based on an MZI structure.
    • Characterization of insertion loss for passive TiO2 multi-mode interferometers (MMIs).
    • Measurement of power consumption (Pπ) and assessment of mechanical stability through bending tests.

    Main Results:

    • Demonstrated flexible TiO2 TOSs operating around 1310 nm.
    • Insertion loss of -3.1 dB per MMI for flexible passive TiO2 2×2 MMIs.
    • Achieved a power consumption (Pπ) of 0.83 mW, an 18-fold decrease compared to rigid counterparts.
    • Device maintained performance after 100 bending operations, showing excellent mechanical stability.

    Conclusions:

    • The study presents a novel flexible titanium oxide TOS, offering significant advantages in power efficiency and durability.
    • These findings provide a new approach for designing and fabricating flexible TOSs for advanced optoelectronic applications.