紧聚焦系统中构造具有超长焦深的光学针  

Construction of light fields with ultra-long depth of focus in tight focus systems

作　　者：王徐坚 李俊毅 郝正宏 康翔宇 王冠学 WANG Xujian;LI Junyi;HAO Zhenghong;KANG Xiangyu;WANG Guanxue(Shanghai Rocksensor Automation Co.,Ltd,Shanghai 201108,China;School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海洛丁森工业自动化设备有限公司,上海201109 [2]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《自动化与仪器仪表》2023年第4期319-323,共5页Automation & Instrumentation

摘　　要：在紧聚焦系统中,由于受到数值孔径的影响,焦斑会限制在很小的范围内。提出了一种在紧聚焦系统中构造具有超长焦深的光学针的方法,基于德拜矢量衍射理论,利用光笔的焦点调控能力,在沿光轴的方向上,对焦点的数量、位置、振幅、相位进行调控,最终在数值孔径为0.95的条件下,成功地实现了约63λ焦深长度的光学针。该研究将在光学压力传感器、高密度的磁光存储、超分辨的光学成像、纳米光刻、光镊、粒子加速、材料加工等领域具有广泛的应用价值。In the tight-focus system,the focal spot is limited to a small range due to the numerical aperture.In this paper,we propose a method to construct an optical needle with an ultra-long focal depth in a tight-focusing system.Based on the Debye vector diffraction theory,the number,position,amplitude,and phase of the focal points are tuned in the direction along the optical axis by using the focal point tuning capability of the optical pen,and finally an optical needle with a focal depth length of about 63λis successfully achieved with a numerical aperture of 0.95.This research will have a wide range of applications in the fields of optical pressure sensor,high-density magneto-optical storage,super-resolution optical imaging,nanolithography,optical tweezers,particle acceleration,and materials processing.

关 键 词：物理光学 紧聚焦 矢量衍射理论 光学针 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置] O436[自动化与计算机技术—控制科学与工程]