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A new method is proposed for shaping a far-field uniform optical needle based on a regular nanostructured metasurface, viz. high-NA (numerical aperture) micro-Fresnel zone plate (FZP). The designed microstructure is comprised of two planar FZP-fragments with different focal lengths. Delicate interference of diffracted beams results in an optical needle at a required working distance in the post-evanescent...
Far-field nanoscale optical needles are obtained using water-immersed planar nanostructured metasurfaces illuminated with a 193nm deep ultra-violet laser. The method is based on the vectorial angular spectrum theory and an established nonlinear optimization model. For a 50μm-diameter metasurface with a linearly polarized beam (x-polarized), an optical needle with 12.4λ0 length has been produced at...
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