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    Engineered metasurfaces enhance narrow bandpass filters, expanding the field of view (FOV) to 120 degrees while maintaining spectral bandwidth. This innovation offers a compact solution for applications like Raman spectroscopy and LiDAR.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Narrow bandpass filters are critical components in diverse optical systems, including spectroscopy, imaging, and communication.
    • A key challenge with traditional thin-film filters is angular dispersion, which limits the usable field of view (FOV) due to spectral blue shifts at oblique angles.

    Purpose of the Study:

    • To overcome the FOV limitations of conventional thin-film filters.
    • To develop an enhanced filter design using engineered metasurfaces for improved angular tolerance and wavefront manipulation.

    Main Methods:

    • Integration of gradient-phase metasurfaces with narrowband thin-film filters.
    • Characterization of the augmented filter's angular tolerance, spectral bandwidth, and field of view.
    • Comparison of the metasurface-integrated filter's footprint with conventional refractive solutions.

    Main Results:

    • The integrated metasurface significantly enhanced angular tolerance, broadening the effective FOV to approximately 120 degrees.
    • The narrow spectral bandwidth (∼1% fractional bandwidth at green) of the original filter was preserved.
    • The metasurface integration resulted in a significantly smaller device footprint compared to traditional refractive optics.

    Conclusions:

    • Engineered metasurfaces offer a powerful method for augmenting thin-film filters, overcoming angular dispersion limitations.
    • The proposed ultrathin metasurface-enhanced filter design provides a compact and effective solution for expanding FOV in optical systems.
    • This technology has broad implications for applications requiring wide-field, spectrally precise optical filtering.