论文标题
从远场到近场微颗粒和纳米颗粒光学诱捕
From far-field to near-field micro- and nanoparticle optical trapping
论文作者
论文摘要
光学镊子是一种非常公认的技术，它已发展为一种标准工具，用于在过去几十年中取得巨大成功，以捕获和操纵微米和亚sibsicron颗粒。尽管光的性质强制对由于Abbe的衍射极限而有效地捕获的最小粒径的限制，但科学家通过工程设计了利用近场效应的新设备来克服这一问题。如今，可以制造金属纳米结构，在激光照明下，产生了不受衍射极限遭受的次级等离子场。与常规光学镊子相比，这一前进可以很好地改善纳米颗粒诱捕，因为它可以放松诱捕要求。在这项工作中，我们回顾了常规光学镊子，所谓的等离子镊子和相关现象的基础。从亚瑟·阿什金（Arthur Ashkin）对这个想法的概念开始，直到最近的改进和应用，我们提出了这些技术及其未来观点所面临的一些挑战。这篇综述的重点是技术的连续改进和创新方面的发展，这些方面是克服了一些主要挑战。
Optical tweezers is a very well-established technique that has developed into a standard tool for trapping and manipulating micron and submicron particles with great success in the last decades. Although the nature of light enforces restrictions on the minimum particle size that can be efficiently trapped due to Abbe's diffraction limit, scientists have managed to overcome this problem by engineering new devices that exploit near-field effects. Nowadays, metallic nanostructures can be fabricated which, under laser illumination, produce a secondary plasmonic field that does not suffer from the diffraction limit. This advance offers a great improvement in nanoparticle trapping, as it relaxes the trapping requirements compared to conventional optical tweezers. In this work, we review the fundamentals of conventional optical tweezers, the so-called plasmonic tweezers, and related phenomena. Starting from the conception of the idea by Arthur Ashkin until recent improvements and applications, we present some of the challenges faced by these techniques as well as their future perspectives. Emphasis in this review is on the successive improvements of the techniques and the innovative aspects that have been devised to overcome some of the main challenges.
