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    This study introduces a novel silicon metasurface with a "double L-shaped" structure to enhance circular dichroism (CD). The innovative design achieves cross-polarization for circularly polarized light, enabling applications in biological detection and optical devices.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Electromagnetism

    Background:

    • Circular polarization dichroism (CD) is a phenomenon sensitive to molecular structure and interactions.
    • Metasurfaces offer unique optical properties through subwavelength structuring.
    • Developing efficient CD-based devices requires precise control over light polarization.

    Purpose of the Study:

    • To investigate the circular dichroism characteristics of novel metasurfaces.
    • To design and optimize a silicon-based metasurface for enhanced CD.
    • To explore the potential of metasurfaces in polarization control and optical filtering.

    Main Methods:

    • Theoretical study based on circular polarization dichroism in electromagnetic fields.
    • Fabrication and characterization of a
    • double L-shaped
    • composite metasurface using silicon.
    • Numerical simulations to analyze the influence of structural parameters on CD spectra.
    • Experimental validation of the metasurface's optical performance across a wide spectrum (1000-1500 nm).

    Main Results:

    • The proposed
    • double L-shaped
    • silicon metasurface exhibits significant CD.
    • Achieved cross-polarization of left- and right-circularly polarized light over a broad spectral range.
    • Demonstrated the metasurface's function as a half-wave plate for left-circularly polarized light at 1302.63 nm.
    • Showcased the metasurface's capability as a filter for right-circularly polarized light.

    Conclusions:

    • The
    • double L-shaped
    • silicon metasurface is an effective platform for manipulating circular polarization.
    • The designed metasurface offers versatile functionalities, including polarization conversion and filtering.
    • This work presents promising applications in biological detection, half-wave plates, and optical filters.