Optical Technique, Volume. 50, Issue 5, 594(2024)

The holes modified infrared polarization-free metalens

FU Kaihu* and TIAN Xue
Author Affiliations
  • Beijing Institute of Remote Sensing Equipment,Beijing 100854,China
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    Metalens are usually composed of rectangle, elliptical or circular micro/nano pillars arrayed with design phase.The manufacture of metalens is diffcult for the size of pillars is always subwavelength and the ratio of height to length/width (or radius) of pillar is usually bigger than 5.The machining accuracy of Direct Laser Writing (DLW) with high machining freedom and mask-free ability doesn’t satisfy the manufacture of pillar type metalens.However, the accuracy of drilling holes and the process stability of DLW is much better than pillar fabrication.Thus, this paper introduces hole type metalens, in which the hole work as the unit cell with various radius to modify the optical phase to foucus. The periphery of hole type metalens is tightly connected as one net, which shows higher structure stability.The break of phase modified cell within pillar type metalens will rarely occure within hole type metalens.The deposition of anti-reflective (AR) film on the back of holes surface of metalens will enhance the transmittance of incident light and improve the harsh environment endurance as mounting this surface to the air and holes surface into the optical system.In this paper, the finite-difference time-domain (FDTD) was applied to the analysis of imaging ability of hole type metalens, which is designed with ZnS substrate, 9μm center wavelength, 1mm focal length.The simulation results show excellent focusabilty and well commercial value.

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    FU Kaihu, TIAN Xue. The holes modified infrared polarization-free metalens[J]. Optical Technique, 2024, 50(5): 594

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    Paper Information

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    Received: Nov. 4, 2023

    Accepted: Mar. 10, 2025

    Published Online: Mar. 10, 2025

    The Author Email: Kaihu FU (fkhcbma@163.com)

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