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MWP phase shifters integrated in PbS-SU8 waveguides.

Javier Hervás, Isaac Suárez, Joaquín Pérez

    Optics Express
    |June 16, 2015
    PubMed
    Summary

    We developed novel microwave phase shifters using lead sulfide (PbS) quantum dots in SU8 waveguides. This technology offers fast tunability and high integration for advanced microwave signal processing.

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    Area of Science:

    • Optoelectronics
    • Nanophotonics
    • Materials Science

    Background:

    • Microwave phase shifters (MPS) are crucial for signal processing.
    • Existing MPS technologies face limitations in tunability and integration.
    • Colloidal quantum dots (QDs) offer unique optical properties for novel device applications.

    Purpose of the Study:

    • To develop a new type of microwave phase shifter (MPS) utilizing lead sulfide (PbS) colloidal quantum dots (QDs).
    • To investigate the performance of PbS-QD-infused SU8 ridge waveguides for optical control of microwave signals.
    • To enhance phase shift performance through a novel bilayer waveguide design.

    Main Methods:

    • Fabrication of ridge waveguides by integrating PbS-QD/SU8 nanocomposite onto a silicon platform.
    • Optical pumping of waveguides below the PbS QD band-gap to induce phase shifts in a 1550 nm microwave signal.
    • Characterization of phase shift performance and propagation losses using experimental measurements.
    • Theoretical modeling based on the slow light effect and coherent population oscillations.

    Main Results:

    • Demonstrated a phase shift in microwave signals modulated by optical pumping of PbS-QD/SU8 waveguides.
    • Achieved improved phase shift in ridge waveguides compared to planar structures due to enhanced light confinement.
    • Proposed a novel bilayer waveguide design to reduce pump beam losses, achieving a 36.5° phase shift at 25 GHz.
    • Validated experimental findings with a theoretical model based on the slow light effect.

    Conclusions:

    • The developed PbS-QD/SU8 nanocomposite waveguides represent a new class of microwave phase shifters.
    • The device offers fast tunability and high integration potential, surpassing current MPS technologies.
    • This technology shows promise for advanced, compact microwave signal processing applications.