Realizing high-quality needle-like beams is crucial for various advanced applications such as microfabrication, super-resolution imaging, and micromanipulation. Here, we report a reliable method to achieve valuable Airy needle-like beams (ANBs) distinguished by both a large depth of focus and a high aspect ratio. This is accomplished by individually modulating and optimizing the amplitude of each ring of circular Airy beams. The proposed iterative algorithm can efficiently optimize these amplitude-modulation coefficients. In the focusing regions, the resulting ANBs exhibit remarkable properties, including axial flat-top (uniform) intensity distribution, extended depth of focus, high aspect ratio, and smaller focal spots. We further experimentally demonstrated that these characteristics endow ANBs with superior capabilities for multiplane microparticle trapping, axial transportation, and super-resolution imaging, particularly when integrated into optical manipulation systems and scanning confocal microscopy setups. The results suggest a wide range of potential applications of ANBs in optical manipulation, imaging, and laser writing.

中文翻译：

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优化艾里针状光束以实现长距离轴向操纵和超分辨率成像


实现高质量的针状光束对于微加工、超分辨率成像和显微操作等各种先进应用至关重要。在这里，我们报告了一种可靠的方法来实现有价值的艾里针状光束（ANB），其特点是大焦深和高纵横比。这是通过单独调制和优化每个圆形艾里光束环的振幅来实现的。所提出的迭代算法可以有效地优化这些调幅系数。在聚焦区域，所得的 ANB 表现出显着的特性，包括轴向平顶（均匀）强度分布、扩展的焦深、高纵横比和更小的焦点。我们进一步通过实验证明，这些特性赋予ANB在多平面微粒捕获、轴向传输和超分辨率成像方面具有卓越的能力，特别是当集成到光学操纵系统和扫描共焦显微镜装置中时。结果表明 ANB 在光学操纵、成像和激光写入方面具有广泛的潜在应用。