基于低色散材料的高效宽带消色差微透镜设计

IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Engineering Pub Date : 2024-07-01 DOI:10.1016/j.eng.2023.08.023
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引用次数: 0

摘要

具有消色差性能的金属透镜为以超小型配置实现高质量成像提供了新的机遇;然而,它们存在制造工艺复杂和聚焦效率低的问题。在这项研究中,我们提出了一种利用低色散材料、适当设计的凸面和厚度轮廓分布,在波长尺度上设计消色差微透镜的有效方法。考虑到绝对色差、相对焦距偏移 (FLS) 和数值孔径 (NA),通过我们实现的几何特征图,可以实现具有一定焦距的微透镜。因此,利用聚焦离子束制造出了设计的消色差熔融石英微透镜,并获得了精确的表面轮廓。制造出的微透镜在 410-680 纳米的可见光波长下平均聚焦效率高达 65%,并具有出色的白光成像消色差能力。此外,该设计还具有偏振不敏感和近衍射限制的优点。这些结果证明了我们提出的消色差微型透镜设计方法的有效性,从而拓展了虚拟现实和增强现实、超小型显微镜和生物内窥镜等微型光学技术的前景。
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Highly Efficient Broadband Achromatic Microlens Design Based on Low-Dispersion Materials

Metalenses with achromatic performance offer a new opportunity for high-quality imaging with an ultra-compact configuration; however, they suffer from complex fabrication processes and low focusing efficiency. In this study, we propose an efficient design method for achromatic microlenses on a wavelength scale using materials with low dispersion, an adequately designed convex surface, and a thickness profile distribution. By taking into account the absolute chromatic aberration, relative focal length shift (FLS), and numerical aperture (NA), microlens with a certain focal length can be realized through our realized map of geometric features. Accordingly, the designed achromatic microlenses with low-dispersion fused silica were fabricated using a focused ion beam, and precise surface profiles were obtained. The fabricated microlenses exhibited a high average focusing efficiency of 65% at visible wavelengths of 410–680 nm and excellent achromatic capability via white light imaging. Moreover, the design exhibited the advantages of being polarization-insensitive and near-diffraction-limited. These results demonstrate the effectiveness of our proposed achromatic microlens design approach, which expands the prospects of miniaturized optics such as virtual and augmented reality, ultracompact microscopes, and biological endoscopy.

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来源期刊
Engineering
Engineering Environmental Science-Environmental Engineering
自引率
1.60%
发文量
335
审稿时长
35 days
期刊介绍: Engineering, an international open-access journal initiated by the Chinese Academy of Engineering (CAE) in 2015, serves as a distinguished platform for disseminating cutting-edge advancements in engineering R&D, sharing major research outputs, and highlighting key achievements worldwide. The journal's objectives encompass reporting progress in engineering science, fostering discussions on hot topics, addressing areas of interest, challenges, and prospects in engineering development, while considering human and environmental well-being and ethics in engineering. It aims to inspire breakthroughs and innovations with profound economic and social significance, propelling them to advanced international standards and transforming them into a new productive force. Ultimately, this endeavor seeks to bring about positive changes globally, benefit humanity, and shape a new future.
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