近场光镊技术研究新进展

光镊技术,又称光学捕获技术,它是利用光的辐射压力来捕获和操纵包括电介质颗粒、生物细胞及生物大分子在内的微小粒子的。近场光镊技术利用近场光学倏逝场随距离急剧衰减的特征,可显著地降低捕获粒子的尺寸,实现纳米捕获。追踪了近场光镊技术的最新进展,包括全内反射相干倏逝场、近场光学镀膜光纤探针尖、激光照明金属探针尖和聚焦倏逝场用于近场光学捕获,并对其进行了比较,分析了它们存在的主要问题和未来发展方向。

Recent advances in near field optical tweezers

Optical tweezers,also known as optical trapping.They are to utilize light radiation pressure to trap and manipulate micro-particles including dielectric spheres,cells and biological macro-molecules.For near field optical tweezers,the nature that near field evanescent wave decays rapidly with the distance may result in a significant reduced trapping volume and thus achieve nano-particle trapping.New advances in near field optical tweezers respectively by coherent evanescent wave generated by total internal reflection,near field metal-coated fiber probe,laser illuminated metal probe and focused evanescent wave are introduced.The characteristics of each methods are compared.The main difficulties and prospect for further investigation are also discussed.