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    This study introduces an all-dielectric double-layer grid grating for angular filtering. The novel design demonstrates excellent angular filtering behavior, reflecting light at incident angles over 12 degrees.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Angular filtering is crucial for controlling light directionality in optical systems.
    • Existing angular filters often suffer from bulky designs or complex fabrication processes.

    Purpose of the Study:

    • To propose and demonstrate an ultra-thin, all-dielectric double-layer grid grating for effective angular filtering.
    • To investigate the angular filtering performance theoretically and experimentally.

    Main Methods:

    • Theoretical analysis of light-matter interaction with the double-layer grid grating.
    • Fabrication using double-beam interference lithography and sputter deposition.
    • Experimental characterization of the angular filtering effect at 633 nm.

    Main Results:

    • Theoretical predictions show sensitive transmission drop with increasing incident angle for TM polarization.
    • Experimental results confirm excellent angular filtering, with near-zero transmission above 12° incident angle.
    • The fabricated filter exhibits a transmitted beam divergence of 7.76° and high transmission (0.936) at normal incidence.

    Conclusions:

    • The all-dielectric double-layer grid grating effectively functions as an angular filter.
    • The proposed filter is ultra-thin, easily fabricated over large areas, and suitable for applications in directional lighting and image processing.