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<p>Micro-Fresnel lenses offer compact, versatile solutions for diffractive elements across various optical systems. While they offer significant advantages, achieving the necessary surface integrity and dimensional accuracy remains a challenge, especially for complex micro-optic arrays. This study introduces a comprehensive methodology for the fabrication of micro-Fresnel lens arrays, including mold design, fabrication, and precise replication for optical imaging. A 1&#xa0;mm diameter Nickel Fresnel mold was fabricated using diamond turning with a 10&#xa0;μm tool nose radius, achieving a resolution of 16 lp/mm when used as a reflective mirror. A 3 × 3 array of replicated micro-Fresnel lenses was incorporated into an optical imaging system, achieving an image resolution of 10 lp/mm. To further improve performance, the integration of denoising, sharpening, and field-of-view expansion algorithms yielded a 21% enhancement in image quality, as measured by the peak signal-to-noise ratio. These findings confirm the potential of micro-Fresnel lenses for high-precision imaging applications and outline a detailed process for their fabrication.</p>

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Design and Fabrication of Micro-Fresnel Lens Array for Optical Imaging Applications

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Van Truong Vu,
  • Hien Nguyen,
  • Youngdurk Park,
  • Hongseok Youn,
  • Hocheol Lee

摘要

Micro-Fresnel lenses offer compact, versatile solutions for diffractive elements across various optical systems. While they offer significant advantages, achieving the necessary surface integrity and dimensional accuracy remains a challenge, especially for complex micro-optic arrays. This study introduces a comprehensive methodology for the fabrication of micro-Fresnel lens arrays, including mold design, fabrication, and precise replication for optical imaging. A 1 mm diameter Nickel Fresnel mold was fabricated using diamond turning with a 10 μm tool nose radius, achieving a resolution of 16 lp/mm when used as a reflective mirror. A 3 × 3 array of replicated micro-Fresnel lenses was incorporated into an optical imaging system, achieving an image resolution of 10 lp/mm. To further improve performance, the integration of denoising, sharpening, and field-of-view expansion algorithms yielded a 21% enhancement in image quality, as measured by the peak signal-to-noise ratio. These findings confirm the potential of micro-Fresnel lenses for high-precision imaging applications and outline a detailed process for their fabrication.