Abstract
A super-oscillation far-field focusing micro-lens based on continuous amplitude modulation is experimentally demonstrated with 40-nm thick width-varied sub-wavelength metallic slit array. The $228\times 200~\mu \text{m}^{\mathrm {\mathbf {2}}}$ micro-lens is designed and fabricated with numerical aperture 0.976 and focal length $40.1\lambda $ for wavelength $\lambda =632.8$ nm. Experimental results show that the focal length is $\sim 26.5\pm 1~\mu \text{m}$ , and the focal line full width at half maximum is $0.379\lambda $ , which is smaller than the corresponding diffraction limit $0.512\lambda $ and the super-oscillation criterion $0.389\lambda $ . A great suppression of sidelobes was observed in the measured focal plane area, and the largest sidelobe intensity was found only 10.6% of the central lobe intensity, leading to a wide field of view.
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