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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Diffractive lenses offer miniaturization potential.
    • Current diffractive lenses struggle with chromatic aberration, limiting their use with multiple wavelengths.
    • Plasmonic metasurfaces provide precise control over light-matter interactions.

    Purpose of the Study:

    • To demonstrate a method for designing diffractive Fresnel zone plate lenses using nanostructured plasmonic metasurfaces.
    • To achieve simultaneous focusing of multiple wavelengths to a single focal point.
    • To enable multiplexing of optical functions on a single substrate with low spectral crosstalk.

    Main Methods:

    • Fabrication of thin nanostructured plasmonic metasurfaces composed of cross and rod-shaped optical nanoantennas.
    • Experimental and simulation-based design of diffractive Fresnel zone plate lenses.
    • Utilizing the polarization and wavelength selectivity of nanoantennas for optical function multiplexing.

    Main Results:

    • Successful demonstration of diffractive lenses capable of focusing pairs of wavelengths to a single focal point.
    • Metasurfaces exhibited strong polarization and wavelength selectivity, enabling multiplexing of two distinct lenses.
    • Achieved low spectral crosstalk between the multiplexed lenses.
    • Demonstrated control over the superposition of colors at the focal point via polarization control.

    Conclusions:

    • Nanostructured plasmonic metasurfaces offer a viable route to ultrathin diffractive lenses with multi-wavelength focusing capabilities.
    • The demonstrated technology can overcome limitations of traditional diffractive optics regarding chromatic aberration.
    • This approach holds significant promise for applications in advanced optical microscopy, including fluorescence and stimulated emission depletion microscopy.