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Related Experiment Video

Updated: Jan 4, 2026

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
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Compact, ultra-broadband plasmonic grating couplers.

Masafumi Ayata, Yuriy Fedoryshyn, Ueli Koch

    Optics Express
    |November 6, 2019
    PubMed
    Summary

    We developed all-metallic grating couplers for efficient fiber coupling. These compact devices convert vertical fiber modes to surface plasmon polaritons, enabling broadband performance.

    Area of Science:

    • Photonics and Nanotechnology
    • Optical Engineering

    Background:

    • Efficient fiber-optic coupling is crucial for integrated photonic circuits.
    • Surface plasmon polaritons (SPPs) offer a pathway for miniaturizing optical components.

    Purpose of the Study:

    • To demonstrate all-metallic grating couplers for vertical fiber-to-plasmonic mode conversion.
    • To achieve compact and broadband coupling with a small footprint.

    Main Methods:

    • Fabrication of all-metallic grating couplers on a metal layer.
    • Characterization using periodic and apodized grating designs.
    • Integration with a focusing arrangement for miniaturization.

    Main Results:

    • Demonstrated vertical fiber mode conversion into surface plasmon polaritons (SPPs).

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  • Achieved a small device footprint of 13.5 × 12 µm².
  • Experimentally obtained a 1-dB bandwidth of 115 nm and coupling efficiency of 2.9 dB.

    • Conclusions:

    • All-metallic grating couplers provide a viable solution for compact and broadband fiber coupling.
    • The demonstrated technology enables efficient integration of optical fibers with plasmonic devices.
    • Further optimization could enhance coupling efficiency and bandwidth for advanced photonic applications.