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Hybrid two-dimensional subwavelength surface-relief grating-mesh structures.

E B Grann, M G Moharam

    Applied Optics
    |November 12, 2010
    PubMed
    Summary
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    Periodic 2D subwavelength structures with gratings and meshes exhibit tunable effective refractive indices based on material placement. Hybrid structures combine advantages, simplifying fabrication.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Subwavelength surface-relief structures are crucial for manipulating light.
    • Understanding their effective optical properties is key for device design.
    • Gratings and meshes offer distinct but complementary optical behaviors.

    Purpose of the Study:

    • To investigate the homogeneous behavior of 2D subwavelength gratings and meshes.
    • To establish relationships between structural parameters and effective refractive indices.
    • To explore hybrid structures combining grating and mesh advantages.

    Main Methods:

    • Theoretical analysis of periodic two-dimensional subwavelength structures.
    • Investigation of structures containing gratings and inverse gratings (meshes).

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  • Determination of structure-parameter-to-effective-index relations.

    • Main Results:

    • Mesh structures yield larger feature sizes near higher refractive index regions.
    • Grating structures yield larger feature sizes near lower refractive index regions.
    • Effective index depends on shape and area of constituent materials, not just area.

    Conclusions:

    • Effective refractive index is tunable by material placement in subwavelength structures.
    • Hybrid grating-mesh structures offer fabrication advantages.
    • The study provides a framework for designing advanced optical metasurfaces.