Abstract
We demonstrate a sub-diffraction flat-top beam shaping device based on sub-wavelength square silicon pillar array at operating wavelength of 10.6 μm, followed with improved Gerchberg-Saxton (G-S) algorithm to enable the advanced shaping processing capability. The theoretical simulation results show that the device generates a sub-diffraction flat-top optical needle with length of 10.6 cm along the optic axis, and its diffraction efficiency is higher than 90%. Moreover, the focal spot, with a transverse size of 3.5 λ, is smaller than the diffraction limit of 6.8 λ. This sub-diffraction beam shaping device with large focal depth has practical applications in laser machining technologies.
Published Version
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