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Angular-dependent polarization-insensitive filter fashioned with zero-contrast grating.

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    We developed a novel polarization-insensitive filter using a free-standing zero-contrast grating (ZCG) on a HfO(2)/Silicon platform. This device shows promising applications for tunable color filters and polarization-insensitive filtering.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Developing polarization-insensitive optical filters is crucial for various photonic applications.
    • Zero-contrast gratings (ZCGs) offer unique optical properties but require careful design and implementation.
    • HfO(2)/Silicon platforms provide a robust base for fabricating advanced optical devices.

    Purpose of the Study:

    • To design and experimentally validate an angular-dependent, polarization-insensitive filter.
    • To investigate the spectral characteristics of a free-standing zero-contrast grating (ZCG).
    • To explore the potential of ZCGs for tunable color filtering applications.

    Main Methods:

    • Rigorous coupled-wave analysis (RCWA) for theoretical simulation of spectral characteristics.
    • Fabrication of a free-standing ZCG on a HfO(2)/Silicon platform.
    • Experimental measurement using an angular-resolved micro-reflectance system.

    Main Results:

    • Experimental demonstration of polarization-insensitive resonances at 595nm (12.8° incidence) and 500nm (14.2° incidence).
    • Observation of distinct yellow and red colors for p- and s-polarized light at normal incidence, respectively.
    • Good agreement between simulated and experimental results, validating the ZCG design.

    Conclusions:

    • The free-standing ZCG device effectively functions as a polarization-insensitive filter.
    • The ZCG structure enables tunable color filtering based on incident light polarization and angle.
    • This technology holds significant promise for advanced optical filters and polarization-controlled devices.