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Stable hybrid plasmonic directional coupler based on an embedded silver nanostructure waveguide.

Jeeban Kumar Nayak, Partha Roy Chaudhuri, Pankaj K Sahoo

    Applied Optics
    |October 6, 2021
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    Summary

    This study presents a stable hybrid plasmonic optical directional coupler using silver nanostructures, achieving 95% power transfer with low propagation loss. The compact design offers excellent field confinement for integrated photonic circuits.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Optoelectronics

    Background:

    • Optical directional couplers are fundamental components in photonic integrated circuits.
    • Achieving high power transfer efficiency and low loss remains a key challenge.

    Purpose of the Study:

    • To present a stable hybrid plasmonic optical directional coupler.
    • To achieve high power transfer efficiency with minimal propagation loss.

    Main Methods:

    • Utilized an embedded silver nanostructure within the waveguides.
    • Employed the finite element method for detailed analysis of transmission characteristics.
    • Characterized performance metrics including excess loss, coupling degree, and directionality.

    Main Results:

    • Achieved a maximum power transfer of up to 95% at an edge-to-edge separation of 0.58 µm.
    • Obtained a low propagation loss of 0.0863 dB/µm.
    • Determined the shortest coupling length for maximum power coupling to be 2.488 µm.

    Conclusions:

    • The proposed compact directional coupler demonstrates good field confinement and low propagation loss.
    • This device holds significant potential for applications in photonic-integrated circuits and optoelectronic industries.