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Updated: Oct 17, 2025

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Flexible broadband white light multimode interference coupler.

Guorong Sui, Fan Liu, Haifei Guo

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    Summary
    This summary is machine-generated.

    Researchers developed a novel RGB on-chip waveguide coupler for micro white light devices. This compact and flexible component achieves high transmission efficiency, overcoming limitations of traditional discrete RGB couplers.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Materials Science

    Background:

    • Micro white light devices are crucial for various applications, driven by advancements in micro broadband white light sources.
    • Compact, efficient, and flexible Red-Green-Blue (RGB) couplers are essential components for broadband white light technology.
    • Traditional RGB couplers, built from discrete components, hinder miniaturization, flexibility, and high transmission efficiency, limiting device development.

    Purpose of the Study:

    • To propose and investigate an on-chip waveguide coupler for RGB beam multiplexing/demultiplexing.
    • To achieve miniaturization, flexibility, and high transmission efficiency in RGB coupler design.
    • To enable advancements in micro white light devices through integrated optical components.

    Main Methods:

    • Design and fabrication of an RGB on-chip waveguide coupler.
    • Utilized SU8 polymer as the waveguide material for flexibility and compatibility with optoelectronic technology.
    • Performance evaluation of the device for RGB beam multiplexing and demultiplexing.

    Main Results:

    • The developed RGB on-chip waveguide coupler achieved a significantly reduced device size of 0.04 mm × 3.6 mm.
    • Demonstrated an average transmission efficiency of 94.6% for RGB beam multiplexing/demultiplexing.
    • The SU8 polymer waveguide material ensures compatibility with flexible optoelectronic integration.

    Conclusions:

    • The proposed on-chip waveguide coupler effectively addresses the limitations of traditional discrete RGB couplers.
    • This integrated device offers a pathway to highly miniaturized and flexible micro white light systems.
    • The technology is poised to significantly advance the development of next-generation micro white light devices.