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    Silicon nanoblocks enable precise control over light phase and amplitude at telecommunication wavelengths. This allows for the design of high-efficiency metalenses with tunable focal spots, achieving sub-wavelength focusing.

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    Area of Science:

    • Nanophotonics
    • Metamaterials
    • Optical Engineering

    Background:

    • Silicon nanostructures support coupled electric and magnetic dipole resonances.
    • Resonances in dielectric nanoparticles can be tuned by geometry.
    • Control over light phase and amplitude is crucial for optical devices.

    Purpose of the Study:

    • To demonstrate simultaneous excitation of electric and magnetic resonance modes in silicon nanoblocks.
    • To achieve full 2π phase control of transmitted light by tuning nanoblock dimensions.
    • To design high-efficiency metalenses with controlled focal spot characteristics.

    Main Methods:

    • Simultaneous excitation of electric and magnetic resonance modes in silicon nanoblocks.
    • Geometrical dimension tuning of silicon cubes for 2π phase control.
    • Utilizing power-flux modulation of scattered signals for light focusing.
    • Implementing amplitude filters for desired focal spot properties.

    Main Results:

    • Achieved simultaneous electric and magnetic resonance modes in silicon nanoblocks at telecommunication wavelengths.
    • Demonstrated 2π phase span by altering nanoblock geometry.
    • Focused incident light with a full width at half maximum (FWHM) of 0.42λeff.
    • Attained apodization with suppressed side lobe levels (SLLs).

    Conclusions:

    • Silicon nanoblocks offer a versatile platform for manipulating light.
    • The proposed method enables the design of efficient metalenses with tailored focal properties.
    • This approach provides a new pathway for advanced optical focusing applications.