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光镊是一门利用光的动量与物质相互作用产生光势阱效应以实现粒子捕获的重要技术,该技术被广泛应用于纳米或微米级微粒的捕获及操控领域。当今技术和需求的发展对光镊系统的光束变换提出了更高的要求,因此需要对捕获光源的光束进行整形,获得光镊所需的光场分布。以激光光束整形的器件为主线,分别介绍在光镊系统中使用棱镜、衍射光学元件、液晶空间光调制器、数字微镜器件、光纤等光学元件进行捕获光源光束整形的情况。列出了这些器件组成的典型整形光路,以及近年来这些器件在光束整形方面的研究进展。同时还介绍了在捕获光源的整形设计中,上述方法的各自特点及相应的捕获能力。
Optical tweezers is an important technology that uses the momentum of light to interact with matter to generate light potential well to realize particle trapping. This technique is widely used in the field of capture and manipulation of nano- or micro-scale particles. Nowadays, the development of technology and demand puts forward higher requirements on the beam transformation of the optical tweezers system. Therefore, it is necessary to shape the light beam of the capturing light source to obtain the light field distribution required by the optical tweezers. The laser beam shaping device as the main line, respectively introduced in the optical tweezers system prism, diffractive optical components, liquid crystal spatial light modulator, digital micromirror device, optical fiber and other optical components to capture the light beam shaping situation. The typical shaping optical paths of these devices are listed, and the research progress of these devices in beam shaping in recent years is listed. At the same time also introduced in the capture light shaping design, the method of the respective characteristics and the corresponding capture capabilities.