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    We developed a scalable method for creating metallic micro-ring arrays in a polymer sheet. These arrays exhibit unique polarization-dependent hotspots, offering potential for tunable optical materials.

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    Area of Science:

    • Nanophotonics
    • Materials Science
    • Optics

    Background:

    • Vertically stacked metallic micro-ring arrays are of interest for photonic applications.
    • Understanding light-matter interactions in such nanostructures is crucial for device development.

    Purpose of the Study:

    • To demonstrate a scalable fabrication method for large-area arrays of vertically stacked metallic micro-rings.
    • To investigate the origin of unusual polarization-dependent hotspots observed in these arrays.
    • To explore the potential for active optical control using the material's elastomeric properties.

    Main Methods:

    • Fabrication of large-area arrays of vertically stacked metallic micro-rings in a deformable polymer sheet.
    • Characterization using point-scanning optical spectroscopy.
    • Comparison with numerical simulations to understand optical phenomena.

    Main Results:

    • Successful demonstration of a simple, scalable fabrication method.
    • Observation of unusual polarization-dependent hotspots dominating reflection images.
    • Identification of individual ring stacks acting as microlenses.
    • Localization of hotspots at connections between stacks, attributed to parabolic gold nanowires.

    Conclusions:

    • The fabricated micro-ring arrays exhibit unique optical properties, including polarization-dependent hotspots.
    • The structure's microlensing and hotspot generation are linked to the arrangement of gold nanowires.
    • The polymer's elastomeric nature allows for active tuning of optical properties by altering array geometry.