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Related Experiment Video

Updated: Jul 26, 2025

Fabrication of Nanoheight Channels Incorporating Surface Acoustic Wave Actuation via Lithium Niobate for Acoustic Nanofluidics
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High coupling efficiency waveguide grating couplers on lithium niobate.

Xuetong Zhou, Ying Xue, Fan Ye

    Optics Letters
    |June 15, 2023
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new grating coupler (GC) for lithium niobate photonics, achieving high coupling efficiency (CE). This approach enhances light coupling without complex fabrication steps.

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    Area of Science:

    • Photonics
    • Materials Science
    • Integrated Optics

    Background:

    • Lithium niobate on insulator (LNOI) is a key platform for photonic integration.
    • Grating couplers (GCs) are essential for efficient light coupling in photonic circuits.
    • Achieving high coupling efficiency (CE) in GCs remains a challenge.

    Purpose of the Study:

    • To propose and validate a novel approach for high CE grating couplers (GCs) on the LNOI platform.
    • To enhance the grating strength and light confinement for improved CE.
    • To demonstrate a fabrication-friendly method for high-performance GCs.

    Main Methods:

    • Utilized a high refractive index polysilicon layer deposited on the GC.
    • Leveraged the high refractive index of polysilicon to enhance light interaction with the grating region.
    • Designed an optical cavity in the vertical direction to boost CE.
    • Performed simulations and experimental validation of the proposed GC structure.

    Main Results:

    • Simulations predicted a CE of -1.40 dB.
    • Experimentally measured CE reached -2.20 dB.
    • Achieved a 3-dB bandwidth of 81 nm (1592 nm to 1673 nm).
    • The high CE GC was realized without bottom metal reflectors or LNOI etching.

    Conclusions:

    • The proposed polysilicon-enhanced GC significantly improves CE in LNOI photonic circuits.
    • This method offers a simpler fabrication process compared to existing techniques.
    • The demonstrated high CE and bandwidth are promising for integrated photonic applications.